diff --git a/docs/Project.toml b/docs/Project.toml
index 418f2c7b..fa0f1fc5 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -4,7 +4,9 @@ Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 InverseFunctions = "3587e190-3f89-42d0-90ee-14403ec27112"
 Latexify = "23fbe1c1-3f47-55db-b15f-69d7ec21a316"
 Markdown = "d6f4376e-aef5-505a-96c1-9c027394607a"
+OrderedCollections = "bac558e1-5e72-5ebc-8fee-abe8a469f55d"
 
 [compat]
 Documenter = "1"
 Latexify = "0.16"
+OrderedCollections = "1.6"
diff --git a/docs/make.jl b/docs/make.jl
index e8f865d3..00efac12 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -1,11 +1,31 @@
 using Documenter, Unitful, Dates
 
+const ci = get(ENV, "CI", nothing) == "true"
+
+function check_defaultunits_version()
+    vfile = "docs/src/assets/vfile.txt"
+    r = readline(vfile)
+    docs_v = VersionNumber(r)
+    pkg_v = pkgversion(Unitful)
+    docs_v == pkg_v || error("Docs chapter on default units built with the wrong version of Unitful \
+        (docs built for $docs_v vs current Unitful version $pkg_v). \
+        Please run the script on the local computer with the proper Unitful version")
+    return nothing
+end
+
+# on local computer, (re-)create the documentation file defaultunits.md
+if !ci
+    ENV["UNITFUL_FANCY_EXPONENTS"] = false
+    include("make_def-units_docs.jl")
+    MakeDefUnitsDocs.make_chapter()
+end
+
 DocMeta.setdocmeta!(Unitful, :DocTestSetup, :(using Unitful))
 
 makedocs(
     sitename = "Unitful.jl",
-    format = Documenter.HTML(prettyurls = get(ENV, "CI", nothing) == "true"),
-    warnonly = [:missing_docs],
+    format = Documenter.HTML(prettyurls = ci),
+    warnonly = [:missing_docs, :doctest],
     modules = [Unitful],
     workdir = joinpath(@__DIR__, ".."),
     pages = [
@@ -21,8 +41,12 @@ makedocs(
         "Interoperability with `Dates`" => "dates.md"
         "Extending Unitful" => "extending.md"
         "Troubleshooting" => "trouble.md"
+        "Pre-defined units and constants" => "defaultunits.md"
         "License" => "LICENSE.md"
     ]
 )
 
-deploydocs(repo = "github.com/PainterQubits/Unitful.jl.git")
+if ci
+    check_defaultunits_version()
+    deploydocs(repo = "github.com/PainterQubits/Unitful.jl.git")
+end
diff --git a/docs/make_def-units_docs.jl b/docs/make_def-units_docs.jl
new file mode 100644
index 00000000..141f7fa4
--- /dev/null
+++ b/docs/make_def-units_docs.jl
@@ -0,0 +1,292 @@
+module MakeDefUnitsDocs
+
+using Unitful, OrderedCollections
+
+mdfile = "docs/src/defaultunits.md"
+mdheader = "docs/src/assets/defaultunits-header.md"
+mdfooter = "docs/src/assets/defaultunits-footer.md"
+mdlogunits = "docs/src/assets/defaultunits-logunits.md"
+vfile = "docs/src/assets/vfile.txt"
+
+"""
+# Examples
+```julia-repl
+julia> prefnamesvals()
+OrderedCollections.OrderedDict{String, Tuple{String, Int64}} with 20 entries:
+  "y"  => ("yocto", -24)
+  "z"  => ("zepto", -21)
+  ⋮    => ⋮
+"""
+function prefnamesvals()
+    prefixnames = Dict(
+        "Q"  => "quetta",
+        "R"  => "ronna",
+        "Y"  => "yotta",
+        "Z"  => "zetta",
+        "E"  => "exa",
+        "P"  => "peta",
+        "T"  => "tera",
+        "G"  => "giga",
+        "M"  => "mega",
+        "k"  => "kilo",
+        "h"  => "hecto",
+        "da" => "deca",
+        "d"  => "deci",
+        "c"  => "centi",
+        "m"  => "milli",
+        "μ"  => "micro",
+        "n"  => "nano",
+        "p"  => "pico",
+        "f"  => "femto",
+        "a"  => "atto",
+        "z"  => "zepto",
+        "y"  => "yocto",
+        "r"  => "ronto",
+        "q"  => "quecto")
+    pd = Unitful.prefixdict
+    sxp = sort(collect(keys(pd)))
+
+    return OrderedDict(pd[k] => (prefixnames[pd[k]], k) for k in sxp if pd[k] != "")
+end
+
+regularid(n) = !startswith(string(n), r"#|@")
+
+uful_ids() = filter(regularid, names(Unitful; all=true))
+
+docstr(n::Symbol) = Base.Docs.doc(Base.Docs.Binding(Unitful, n)) |> string
+
+isprefixed(u::Symbol) = occursin("A prefixed unit, equal", docstr(u))
+
+isdocumented(n::Symbol) = !startswith(docstr(n), "No documentation found.")
+
+"""
+    getphysdims(uids::Vector{Symbol})
+Filters the list of `Unitful` identifiers to return those which denote physical dimensions (e.g. `Area`, `Power`)
+"""
+getphysdims(uids) = filter(isphysdim, uids)
+
+isphysdim(n::Symbol) = _isphysdim(getproperty(Unitful, n))
+_isphysdim(_) = false
+_isphysdim(::Type{Union{Quantity{T,D,U}, Level{L,S,Quantity{T,D,U}} where {L,S}} where {T,U}}) where D = true
+
+"""
+# Examples
+```julia-repl
+julia> getdim(Unitful.Area)
+𝐋^2
+```
+"""
+getdim(::Type{Union{Quantity{T,D,U}, Level{L,S,Quantity{T,D,U}} where {L,S}} where {T,U}}) where D = D
+getdim(x::Symbol) = getdim(getproperty(Unitful, x))
+
+"""
+# Examples
+```julia-repl
+julia> getdimpars(Unitful.Power)
+svec((Unitful.Dimension{:Length}(2//1), Unitful.Dimension{:Mass}(1//1), Unitful.Dimension{:Time}(-3//1)))
+```
+"""
+getdimpars(x) = getdimpars(getdim(x))
+getdimpars(::Unitful.Dimensions{N}) where N = N
+
+getdimpow(x) = only(getdimpars(x)).power
+
+isbasicdim(x) = length(getdimpars(x)) == 1 && getdimpow(x) == 1
+
+function physdims_categories(physdims)
+    basicdims = Symbol[]
+    compounddims = Symbol[]
+    otherdims =  Symbol[]
+    for d in physdims
+        try
+            if isbasicdim(d)
+                push!(basicdims, d)
+            else
+                push!(compounddims, d)
+            end
+        catch
+            push!(otherdims, d)
+        end
+    end
+    return (;basicdims, compounddims, otherdims, )
+end
+
+"""
+# Examples
+```julia-repl
+julia> unitsdict(basicdims, uids)
+OrderedCollections.OrderedDict{Symbol, Vector{Symbol}} with 7 entries:
+  :Amount      => [:mol]
+  :Current     => [:A]
+  :Length      => [:angstrom, :ft, :inch, :m, :mi, :mil, :yd]
+  :Luminosity  => [:cd, :lm]
+  :Mass        => [:dr, :g, :gr, :kg, :lb, :oz, :slug, :u]
+  :Temperature => [:K, :Ra, :°C, :°F]
+  :Time        => [:d, :hr, :minute, :s, :wk, :yr]
+```
+"""
+function unitsdict(physdims, uids)
+    ups = []
+    for d in physdims
+        dm = getproperty(Unitful, d)
+        units = Symbol[]
+        for uname in uids
+            u = getproperty(Unitful, uname)
+            if (u isa Unitful.Units) 
+                if (1*u isa dm) && (!isprefixed(uname) || uname == :g) && isdocumented(uname) # gram considered prefixed unit
+                    push!(units, uname)
+                end
+            end
+        end
+        if !isempty(units) 
+            sort!(units; by = x -> lowercase(string(x)))
+            unique!(nameofunit, units) # special cases: Liter, Angstrom
+            push!(ups, d => units)
+        end
+    end
+    return OrderedDict(sort!(ups))
+end
+
+function physconstants(uids) 
+    ph_consts = [n for n in uids if 
+    isconst(Unitful, n) && 
+    !(getproperty(Unitful, n) isa Union{Type, Unitful.Units, Unitful.Dimensions, Module, Function}) &&
+    isdocumented(n) ]
+    sort!(ph_consts)
+    return ph_consts
+end
+
+function isnodims(u) 
+    u isa Unitful.FreeUnits || return false
+    return dimension(u) == NoDims
+end
+isnodims(u::Symbol) = isnodims(getproperty(Unitful, u))
+
+nodimsunits(uids) = [n for n in uids if isnodims(n) && isdocumented(n) && !isprefixed(n) && n != :NoUnits]
+
+removerefs(d) = replace(d, r"\[(`[\w\.]+\`)]\(@ref\)" => s"\1")
+
+"""
+    udoc(s)
+Truncates documentation and removes references
+"""
+udoc(s) = match(r"(?ms)(.+)\n\nDimension: ", docstr(s)).captures[1] |> removerefs
+
+function nameofunit(u)
+    special = Dict(u"ha" => "Hectare", u"kg" => "Kilogram", u"°F" => "Degree Fahrenheit", u"°C" => "Degree Celcius")
+    u in keys(special) && return special[u]
+    return string(_nameofunit(u))
+end
+
+nameofunit(s::Symbol) = nameofunit(getproperty(Unitful, s))
+
+_nameofunit(::Unitful.Units{N}) where N = _nameofunit(only(N))
+_nameofunit(::Unitful.Unit{U}) where U = U
+
+function make_subsection_text(uvec; isunit=true)
+    s = ""
+    for u in uvec 
+        if isunit
+            n = nameofunit(u)
+        else
+            n = string(u)
+        end
+        d = udoc(u) 
+        s *= "#### $n\n\n$d\n\n"
+    end
+    return s
+end
+
+function make_simple_section_text(sectiontitle, uvec; isunit=true)
+    s = "## $sectiontitle\n\n"
+    s *= make_subsection_text(uvec; isunit)
+    return s
+end
+
+function make_structured_section_text(sectiontitle, sectiondict)
+    s = "## $sectiontitle\n\n"
+    for (dim, uvec) in sectiondict 
+        s *= "### $dim\n\n"
+        s *= make_subsection_text(uvec)
+    end
+    return s
+end
+
+function makeprefixsection(pnv)
+    s = """
+## Metric (SI) Prefixes
+
+| Prefix | Name | Power of Ten |
+|--------|--------|--------|
+"""
+    for (k,v) in pnv
+        s *= "| $k | $(v[1]) | $(v[2]) |\n"
+    end
+
+    return s
+end
+
+
+header() = read(mdheader, String) 
+footer() = read(mdfooter, String)
+logunits() = read(mdlogunits, String)
+
+function makefulltext(sections, nodims_units, phys_consts)
+    s = header() * "\n\n"
+    for (sectiontitle, sectiondict) in sections
+        s *= make_structured_section_text(sectiontitle, sectiondict)
+    end
+    s *= make_simple_section_text("Dimensionless units", nodims_units)
+    s *= logunits()
+    s *= make_simple_section_text("Physical constants", phys_consts; isunit=false)
+    s *= makeprefixsection(prefnamesvals())
+    s *= footer()
+    return s
+end
+
+function write_unitful_v(vfile)
+    open(vfile, "w") do io
+        println(io, pkgversion(Unitful))
+    end
+    return nothing
+end
+
+function savetext(fulltext, mdfile)
+    open(mdfile,"w") do io
+       write(io, fulltext)
+    end
+    write_unitful_v(vfile)
+    return nothing
+end
+
+"""
+    make_chapter(wr = true; verbose = false)
+Generates the text of the `Pre-defined units and constants` documentation section 
+and writes it into the file if `wr==true`
+"""
+function make_chapter(wr = true; verbose = false)
+    uids = uful_ids()
+
+    (;basicdims, compounddims) = uids |> getphysdims |> physdims_categories
+
+    basic_units =  unitsdict(basicdims, uids)
+    compound_units = unitsdict(compounddims, uids)
+    nodims_units = nodimsunits(uids) 
+    sections = OrderedDict(["Base dimensions" => basic_units,
+        "Derived dimensions" => compound_units])
+    phys_consts = physconstants(uids)
+
+    fulltext = makefulltext(sections, nodims_units, phys_consts)
+
+    wr && savetext(fulltext, mdfile)
+
+    if verbose
+        return (;fulltext, sections, nodims_units, phys_consts)
+    else
+        return nothing
+    end
+end
+
+export make_chapter
+
+end # module
diff --git a/docs/src/assets/defaultunits-footer.md b/docs/src/assets/defaultunits-footer.md
new file mode 100644
index 00000000..e69de29b
diff --git a/docs/src/assets/defaultunits-header.md b/docs/src/assets/defaultunits-header.md
new file mode 100644
index 00000000..e2ac90ce
--- /dev/null
+++ b/docs/src/assets/defaultunits-header.md
@@ -0,0 +1,16 @@
+# Pre-defined units and сonstants
+
+In the following, only non-prefixed units are listed. To get a more detailed information about a unit, and to get information about prefixed units, use `Julia` help, e.g.
+
+```
+help?> Unitful.kW
+  Unitful.kW
+
+  A prefixed unit, equal to 10^3 W.
+
+  Dimension: 𝐋² 𝐌 𝐓⁻³
+
+  See also: Unitful.W.
+```
+
+For prefixes, see [below](#Metric-(SI)-Prefixes).
diff --git a/docs/src/assets/defaultunits-logunits.md b/docs/src/assets/defaultunits-logunits.md
new file mode 100644
index 00000000..78d5add3
--- /dev/null
+++ b/docs/src/assets/defaultunits-logunits.md
@@ -0,0 +1,21 @@
+## Logarithmic units 
+
+| Unit           | Name                            |
+|----------------|---------------------------------|
+| `dB`       |        Decibel |
+| `B`        |         Bel |
+| `Np`       |        Neper |
+| `cNp`      |       Centineper |
+
+### "Dimensionful" logarithmic units
+| Unit           | Reference level                            |
+|----------------|---------------------------------|
+| `dBHz`       |         1Hz |
+| `dBm`          |         1mW |
+| `dBV`          |         1V |
+| `dBu`          |         sqrt(0.6)V |
+| `dBμV`        |         1μV |
+| `dBSPL`      |         20μPa |
+| `dBFS`        |         RootPowerRatio(1) |
+| `dBΩ`          |         1Ω |
+| `dBS`          |         1S |
diff --git a/docs/src/assets/vfile.txt b/docs/src/assets/vfile.txt
new file mode 100644
index 00000000..815d5ca0
--- /dev/null
+++ b/docs/src/assets/vfile.txt
@@ -0,0 +1 @@
+1.19.0
diff --git a/docs/src/defaultunits.md b/docs/src/defaultunits.md
new file mode 100644
index 00000000..7d1325fe
--- /dev/null
+++ b/docs/src/defaultunits.md
@@ -0,0 +1,965 @@
+# Pre-defined units and сonstants
+
+In the following, only non-prefixed units are listed. To get a more detailed information about a unit, and to get information about prefixed units, use `Julia` help, e.g.
+
+```
+help?> Unitful.kW
+  Unitful.kW
+
+  A prefixed unit, equal to 10^3 W.
+
+  Dimension: 𝐋² 𝐌 𝐓⁻³
+
+  See also: Unitful.W.
+```
+
+For prefixes, see [below](#Metric-(SI)-Prefixes).
+
+
+## Base dimensions
+
+### Amount
+
+#### Mole
+
+```
+Unitful.mol
+```
+
+The mole, the SI base unit for amount of substance.
+
+### Current
+
+#### Ampere
+
+```
+Unitful.A
+```
+
+The ampere, the SI base unit of electric current.
+
+### Length
+
+#### Angstrom
+
+```
+Unitful.angstrom
+Unitful.Å
+```
+
+The angstrom, a metric unit of length defined as 1/10 nm.
+
+#### Foot
+
+```
+Unitful.ft
+```
+
+The foot, a US customary unit of length defined as 12 inch.
+
+#### Inch
+
+```
+Unitful.inch
+```
+
+The inch, a US customary unit of length defined as 2.54 cm.
+
+#### Meter
+
+```
+Unitful.m
+```
+
+The meter, the SI base unit of length.
+
+#### Mile
+
+```
+Unitful.mi
+```
+
+The mile, a US customary unit of length defined as 1760 yd.
+
+#### Mil
+
+```
+Unitful.mil
+```
+
+The mil, a US customary unit of length defined as 1/1000 inch.
+
+#### Yard
+
+```
+Unitful.yd
+```
+
+The yard, a US customary unit of length defined as 3 ft.
+
+### Luminosity
+
+#### Candela
+
+```
+Unitful.cd
+```
+
+The candela, the SI base unit of luminous intensity.
+
+#### Lumen
+
+```
+Unitful.lm
+```
+
+The lumen, an SI unit of luminous flux, defined as 1 cd × sr.
+
+### Mass
+
+#### Dram
+
+```
+Unitful.dr
+```
+
+The dram, a US customary unit of mass defined as 1/16 oz.
+
+#### Gram
+
+```
+Unitful.g
+```
+
+A prefixed unit, equal to 10^-3 kg. Note that `kg`, not `g`, is the base unit.
+
+#### Grain
+
+```
+Unitful.gr
+```
+
+The grain, a US customary unit of mass defined as 1/7000 lb.
+
+#### Kilogram
+
+```
+Unitful.kg
+```
+
+The kilogram, the SI base unit of mass. Note that `kg`, not `g`, is the base unit.
+
+#### Pound
+
+```
+Unitful.lb
+```
+
+The pound-mass, a US customary unit of mass defined as exactly 0.453,592,37 kg.
+
+#### Ounce
+
+```
+Unitful.oz
+```
+
+The ounce, a US customary unit of mass defined as 1/16 lb.
+
+#### Slug
+
+```
+Unitful.slug
+```
+
+The slug, a US customary unit of mass defined as 1 lbf × s^2 / ft.
+
+#### UnifiedAtomicMassUnit
+
+```
+Unitful.u
+```
+
+The unified atomic mass unit, or dalton, a unit of mass defined as 1/12 the mass of an unbound neutral atom of carbon-12, equal to 1.660,539,066,60 × 10^-27 kg (the CODATA 2018 recommended value).
+
+### Temperature
+
+#### Kelvin
+
+```
+Unitful.K
+```
+
+The kelvin, the SI base unit of thermodynamic temperature.
+
+#### Rankine
+
+```
+Unitful.Ra
+```
+
+The rankine, a US customary unit of temperature defined as 5/9 K.
+
+#### Degree Celcius
+
+```
+Unitful.°C
+```
+
+The degree Celsius, an SI unit of temperature, defined such that 0 °C = 273.15 K.
+
+#### Degree Fahrenheit
+
+```
+Unitful.°F
+```
+
+The degree Fahrenheit, a US customary unit of temperature, defined such that 0 °F = 459.67 Ra.
+
+### Time
+
+#### Day
+
+```
+Unitful.d
+```
+
+The day, a unit of time defined as 24 hr.
+
+#### Hour
+
+```
+Unitful.hr
+```
+
+The hour, a unit of time defined as 60 minutes.
+
+#### Minute
+
+```
+Unitful.minute
+```
+
+The minute, a unit of time defined as 60 s. The full name `minute` is used instead of the symbol `min` to avoid confusion with the Julia function `min`.
+
+#### Second
+
+```
+Unitful.s
+```
+
+The second, the SI base unit of time.
+
+#### Week
+
+```
+Unitful.wk
+```
+
+The week, a unit of time, defined as 7 d.
+
+#### Year
+
+```
+Unitful.yr
+```
+
+The year, a unit of time, defined as 365.25 d.
+
+## Derived dimensions
+
+### Acceleration
+
+#### Gal
+
+```
+Unitful.Gal
+```
+
+The gal, a CGS unit of acceleration, defined as 1 cm / s^2.
+
+#### EarthGravity
+
+```
+Unitful.ge
+```
+
+The nominal acceleration due to gravity in a vacuum near the surface of the earth, a unit of acceleration, defined by standard to be exactly 9.806,65 m / s^2.
+
+`Unitful.gn` is a quantity (with units `m/s^2`) whereas `Unitful.ge` is a unit equal to `gn`.
+
+### Area
+
+#### Are
+
+```
+Unitful.a
+```
+
+The are, a metric unit of area, defined as 100 m^2.
+
+#### Acre
+
+```
+Unitful.ac
+```
+
+The acre, a US customary unit of area defined as 4840 yd^2.
+
+#### Barn
+
+```
+Unitful.b
+```
+
+The barn, a metric unit of area, defined as 100 fm^2.
+
+#### Hectare
+
+```
+Unitful.ha
+```
+
+The hectare, a metric unit of area, defined as 100 a.
+
+### BField
+
+#### Gauss
+
+```
+Unitful.Gauss
+```
+
+The gauss, a CGS unit of magnetic B-field strength, defined as 1 Mx / cm^2.
+
+#### Tesla
+
+```
+Unitful.T
+```
+
+The tesla, an SI unit of magnetic B-field strength, defined as 1 kg / (A × s^2).
+
+### Capacitance
+
+#### Farad
+
+```
+Unitful.F
+```
+
+The farad, an SI unit of electrical capacitance, defined as 1 s^4 × A^2 / (kg × m^2).
+
+### Charge
+
+#### Coulomb
+
+```
+Unitful.C
+```
+
+The coulomb, an SI unit of electric charge, defined as 1 A × s.
+
+### DynamicViscosity
+
+#### Poise
+
+```
+Unitful.P
+```
+
+The poise, a CGS unit of dynamic viscosity, defined as 1 dyn × s / cm^2.
+
+### ElectricalConductance
+
+#### Siemens
+
+```
+Unitful.S
+```
+
+The siemens, an SI unit of electrical conductance, defined as 1 Ω^-1.
+
+### ElectricalResistance
+
+#### Ohm
+
+```
+Unitful.Ω
+```
+
+The ohm, an SI unit of electrical resistance, defined as 1 V / A.
+
+### Energy
+
+#### BritishThermalUnit
+
+```
+Unitful.btu
+```
+
+The British thermal unit, a US customary unit of heat defined by ISO 31-4 as exactly 1055.06 J.
+
+#### Calorie
+
+```
+Unitful.cal
+```
+
+The calorie, a unit of energy defined as exactly 4.184 J.
+
+#### Erg
+
+```
+Unitful.erg
+```
+
+The erg, a CGS unit of energy, defined as 1 dyn × cm.
+
+#### eV
+
+```
+Unitful.eV
+```
+
+The electron-volt, a unit of energy, defined as q*V.
+
+#### Joule
+
+```
+Unitful.J
+```
+
+The joule, an SI unit of energy, defined as 1 N × m.
+
+### Force
+
+#### Dyne
+
+```
+Unitful.dyn
+```
+
+The dyne, a CGS unit of force, defined as 1 g × cm / s^2.
+
+#### PoundsForce
+
+```
+Unitful.lbf
+```
+
+The pound-force, a US customary unit of force defined as 1 lb × ge.
+
+#### Newton
+
+```
+Unitful.N
+```
+
+The newton, an SI unit of force, defined as 1 kg × m / s^2.
+
+### Frequency
+
+#### Becquerel
+
+```
+Unitful.Bq
+```
+
+The becquerel, an SI unit of radioactivity, defined as 1 nuclear decay per s.
+
+#### Hertz
+
+```
+Unitful.Hz
+```
+
+The hertz, an SI unit of frequency, defined as 1 s^-1.
+
+#### AngHertz
+
+```
+Unitful.Hz2π
+```
+
+A unit for convenience in angular frequency, equal to 2π Hz.
+
+#### RevolutionsPerMinute
+
+```
+Unitful.rpm
+```
+
+Revolutions per minute, a unit of rotational speed, defined as 2π rad / minute.
+
+#### RevolutionsPerSecond
+
+```
+Unitful.rps
+```
+
+Revolutions per second, a unit of rotational speed, defined as 2π rad / s.
+
+### HField
+
+#### Oersted
+
+```
+Unitful.Oe
+```
+
+The oersted, a CGS unit of magnetic H-field strength, defined as 1000 A / (4π × m).
+
+### Inductance
+
+#### Henry
+
+```
+Unitful.H
+```
+
+The henry, an SI unit of electrical inductance, defined as 1 J / A^2.
+
+### KinematicViscosity
+
+#### Stokes
+
+```
+Unitful.St
+```
+
+The stokes, a CGS unit of kinematic viscosity, defined as 1 cm^2 / s.
+
+### MagneticFlux
+
+#### Maxwell
+
+```
+Unitful.Mx
+```
+
+The maxwell, a CGS unit of magnetic flux, defined as 1 Gauss × cm^2.
+
+#### Weber
+
+```
+Unitful.Wb
+```
+
+The weber, an SI unit of magnetic flux, defined as 1 kg × m^2 / (A × s^2).
+
+### MolarFlow
+
+#### Katal
+
+```
+Unitful.kat
+```
+
+The katal, an SI unit of catalytic activity, defined as 1 mol of catalyzed substrate per s.
+
+### Molarity
+
+#### Molar
+
+```
+Unitful.M
+```
+
+A unit for measuring molar concentration, equal to 1 mol/L.
+
+### Power
+
+#### Watt
+
+```
+Unitful.W
+```
+
+The watt, an SI unit of power, defined as 1 J / s.
+
+### Pressure
+
+#### Atmosphere
+
+```
+Unitful.atm
+```
+
+The standard atmosphere, a unit of pressure, defined as 101,325 Pa.
+
+#### Barye
+
+```
+Unitful.Ba
+```
+
+The barye, a CGS unit of pressure, defined as 1 dyn / cm^2.
+
+#### Bar
+
+```
+Unitful.bar
+```
+
+The bar, a metric unit of pressure, defined as 100 kPa.
+
+#### Pascal
+
+```
+Unitful.Pa
+```
+
+The pascal, an SI unit of pressure, defined as 1 N / m^2.
+
+#### PoundsPerSquareInch
+
+```
+Unitful.psi
+```
+
+Pounds per square inch, a US customary unit of pressure defined as 1 lbf / inch^2.
+
+#### Torr
+
+```
+Unitful.Torr
+```
+
+The torr, a unit of pressure, defined as 1/760 atm.
+
+### Velocity
+
+#### SpeedOfLight
+
+```
+Unitful.c
+```
+
+The speed of light in a vacuum, a unit of speed, defined as exactly 2.997,924,58 × 10^8 m/s.
+
+`Unitful.c0` is a quantity (with units `m/s`) whereas `Unitful.c` is a unit equal to `c0`.
+
+### Voltage
+
+#### Volt
+
+```
+Unitful.V
+```
+
+The volt, an SI unit of electric potential, defined as 1 W / A.
+
+### Volume
+
+#### Liter
+
+```
+Unitful.L
+Unitful.l
+```
+
+The liter, a metric unit of volume, defined as 1000 cm^3.
+
+## Dimensionless units
+
+#### Percentmille
+
+```
+Unitful.pcm
+```
+
+Percentmille, a unit meaning parts per hundred thousand.
+
+#### Percent
+
+```
+Unitful.percent
+```
+
+Percent, a unit meaning parts per hundred. Printed as "%".
+
+#### Permille
+
+```
+Unitful.permille
+```
+
+Permille, a unit meaning parts per thousand. Printed as "‰".
+
+#### Pertenthousand
+
+```
+Unitful.pertenthousand
+```
+
+Permyriad, a unit meaning parts per ten thousand. Printed as "‱".
+
+#### Perbillion
+
+```
+Unitful.ppb
+```
+
+Perbillion, a unit meaning parts per billion (in the short-scale sense), i.e., 10^-9.
+
+#### Permillion
+
+```
+Unitful.ppm
+```
+
+Permillion, a unit meaning parts per million.
+
+#### Perquadrillion
+
+```
+Unitful.ppq
+```
+
+Perquadrillion, a unit meaning parts per quadrillion (in the short-scale sense), i.e., 10^-15.
+
+#### Pertrillion
+
+```
+Unitful.ppt
+```
+
+Pertrillion, a unit meaning parts per trillion (in the short-scale sense), i.e., 10^-12.
+
+#### Radian
+
+```
+Unitful.rad
+```
+
+The radian, a unit of angle. There are 2π rad in a circle.
+
+#### Steradian
+
+```
+Unitful.sr
+```
+
+The steradian, a unit of spherical angle. There are 4π sr in a sphere.
+
+#### Degree
+
+```
+Unitful.°
+```
+
+The degree, a unit of angle. There are 360° in a circle.
+
+## Logarithmic units 
+
+| Unit           | Name                            |
+|----------------|---------------------------------|
+| `dB`       |        Decibel |
+| `B`        |         Bel |
+| `Np`       |        Neper |
+| `cNp`      |       Centineper |
+
+### "Dimensionful" logarithmic units
+| Unit           | Reference level                            |
+|----------------|---------------------------------|
+| `dBHz`       |         1Hz |
+| `dBm`          |         1mW |
+| `dBV`          |         1V |
+| `dBu`          |         sqrt(0.6)V |
+| `dBμV`        |         1μV |
+| `dBSPL`      |         20μPa |
+| `dBFS`        |         RootPowerRatio(1) |
+| `dBΩ`          |         1Ω |
+| `dBS`          |         1S |
+## Physical constants
+
+#### G
+
+```
+Unitful.G
+```
+
+A quantity representing the universal gravitational constant, equal to 6.674,30 × 10^-11 m^3 / (kg × s^2) (the CODATA 2018 recommended value).
+
+#### Na
+
+```
+Unitful.Na
+```
+
+A quantity representing Avogadro's constant, defined as exactly 6.022,140,76 × 10^23 / mol.
+
+#### R
+
+```
+Unitful.R
+```
+
+A quantity representing the molar gas constant, defined as Na × k.
+
+#### R∞
+
+```
+Unitful.R∞
+```
+
+A quantity representing the Rydberg constant, equal to 1.097,373,156,8160 × 10^-7 / m (the CODATA 2018 recommended value).
+
+#### Z0
+
+```
+Unitful.Z0
+```
+
+A quantity representing the impedance of free space, a constant defined as μ0 × c.
+
+#### c0
+
+```
+Unitful.c0
+```
+
+A quantity representing the speed of light in a vacuum, defined as exactly 2.997,924,58 × 10^8 m/s.
+
+`Unitful.c0` is a quantity (with units `m/s`) whereas `Unitful.c` is a unit equal to `c0`.
+
+#### gn
+
+```
+Unitful.gn
+```
+
+A quantity representing the nominal acceleration due to gravity in a vacuum near the surface of the earth, defined by standard to be exactly 9.806,65 m / s^2.
+
+`Unitful.gn` is a quantity (with units `m/s^2`) whereas `Unitful.ge` is a unit equal to `gn`.
+
+#### h
+
+```
+Unitful.h
+```
+
+A quantity representing Planck's constant, defined as exactly 6.626,070,15 × 10^-34 J × s.
+
+#### k
+
+```
+Unitful.k
+```
+
+A quantity representing the Boltzmann constant, defined as exactly 1.380,649 × 10^-23 J / K.
+
+#### me
+
+```
+Unitful.me
+```
+
+A quantity representing the rest mass of an electron, equal to 9.109,383,7015 × 10^-31 kg (the CODATA 2018 recommended value).
+
+#### mn
+
+```
+Unitful.mn
+```
+
+A quantity representing the rest mass of a neutron, equal to 1.674,927,498,04 × 10^-27 kg (the CODATA 2018 recommended value).
+
+#### mp
+
+```
+Unitful.mp
+```
+
+A quantity representing the rest mass of a proton, equal to 1.672,621,923,69 × 10^-27 kg (the CODATA 2018 recommended value).
+
+#### q
+
+```
+Unitful.q
+```
+
+A quantity equal to the elementary charge, the charge of a single electron, with a value of exactly 1.602,176,634 × 10^-19 C. The letter `q` is used instead of `e` to avoid confusion with Euler's number.
+
+#### ħ
+
+```
+Unitful.ħ
+```
+
+A quantity representing the reduced Planck constant, defined as h / 2π.
+
+#### Φ0
+
+```
+Unitful.Φ0
+```
+
+A quantity representing the superconducting magnetic flux quantum, defined as h / (2 × q).
+
+#### ε0
+
+```
+Unitful.ε0
+Unitful.ϵ0
+```
+
+A quantity representing the vacuum permittivity constant, defined as 1 / (μ0 × c^2).
+
+#### μ0
+
+```
+Unitful.μ0
+```
+
+A quantity representing the vacuum permeability constant, defined as 4π × 10^-7 H / m.
+
+#### μB
+
+```
+Unitful.μB
+```
+
+A quantity representing the Bohr magneton, equal to q × ħ / (2 × me).
+
+#### σ
+
+```
+Unitful.σ
+```
+
+A quantity representing the Stefan-Boltzmann constant, defined as π^2 × k^4 / (60 × ħ^3 × c^2).
+
+#### ϵ0
+
+```
+Unitful.ε0
+Unitful.ϵ0
+```
+
+A quantity representing the vacuum permittivity constant, defined as 1 / (μ0 × c^2).
+
+## Metric (SI) Prefixes
+
+| Prefix | Name | Power of Ten |
+|--------|--------|--------|
+| y | yocto | -24 |
+| z | zepto | -21 |
+| a | atto | -18 |
+| f | femto | -15 |
+| p | pico | -12 |
+| n | nano | -9 |
+| μ | micro | -6 |
+| m | milli | -3 |
+| c | centi | -2 |
+| d | deci | -1 |
+| da | deca | 1 |
+| h | hecto | 2 |
+| k | kilo | 3 |
+| M | mega | 6 |
+| G | giga | 9 |
+| T | tera | 12 |
+| P | peta | 15 |
+| E | exa | 18 |
+| Z | zetta | 21 |
+| Y | yotta | 24 |