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+.if n .ds / /
+.if t .ds / \z/\h'\w'*'u'
+.TH UNITS 7
+.CT 1 inst_info
+.SH NAME
+units \- conversion program
+.SH SYNOPSIS
+.B units
+.SH DESCRIPTION
+.I Units
+converts quantities expressed
+in various standard scales to
+their equivalents in other scales.
+It works interactively in this fashion:
+.PP
+.EX
+You have: inch
+You want: cm
+* 2.54
+/ 0.393701
+.EE
+.PP
+Quantities are specified using the following grammar:
+.TP
+.IR Unit :
+.I Empty
+|\|
+.I Unit Term
+|\|
+.IB Unit " / " Term
+.TP
+.IR Term :
+.I Number
+|\|
+.I Name
+|\|
+.BI ( " Unit " )
+|\|
+.br
+.BI square " Term
+|\|
+.BI sq " Term
+|\|
+.BI cube " Term
+|\|
+.BI cu " Term
+|\|
+.br
+.IB Term " ^ " Number
+.ig
+.PP
+\fIUnit\fP:	\fIEmpty\fP
+	\fIUnit\fP \fITerm\fP
+	\fIUnit\fP \fL/\fP \fITerm\fP
+\fITerm\fP:	\fINumber\fP
+	\fIName\fP
+	\fL(\fP \fIUnit\fP \fL)\fP
+	\fLsquare\fP \fITerm\fP
+	\fLsq\fP \fITerm\fP
+	\fLcube\fP \fITerm\fP
+	\fLcu\fP \fITerm\fP
+	\fITerm\fP \fL^\fP \fINumber\fP
+.fi
+..
+.PP
+Numbers are specified in the form expected by
+.IR atof (3).
+Names are maximal strings of non-numeric, non-punctuation characters.
+Powers are indicated by the 
+.L ^
+operator or by the words
+.L square
+.RL ( sq )
+and
+.L cube
+.RL ( cu ).
+Parentheses alter grouping.
+The empty unit has value 1.
+Terms are multiplied together unless connected by
+.L /
+for inversion, e.g.
+.LR "15 pounds force/sq in" .
+.PP
+Most familiar units,
+abbreviations, and metric prefixes are recognized,
+together with a generous leavening of exotica
+and a few constants of nature including:
+.IP
+.de fq
+\f5\\$1\\fP	\\$2 \\$3 \\$4 \\$5 \\$6
+..
+.nf
+.fq pi ratio of circumference to diameter
+.fq c speed of light
+.fq e charge on an electron
+.fq g acceleration of gravity
+.fq force same as \f5g\fP
+.fq mole Avogadro's number
+.fq water "pressure head per unit height of water"
+.fq au astronomical unit
+.fi
+.PP
+The
+.L pound
+is a unit of
+mass.
+Compound names are run together, e.g.
+.LR lightyear .
+British units that differ from their US counterparts
+are prefixed thus:
+.LR brgallon .
+Currency is denoted
+.LR belgiumfranc ,
+.LR britainpound ,
+etc.
+.PP
+A response of 
+.L ?
+to `You want:' displays all known units
+conformable with the `You have:' quantity.
+.PP
+The complete list of units can be found in
+.F /usr/lib/Units
+and
+.FR /n/alice/usr/td/Monetary.units .
+.SH FILES
+.F /usr/lib/Units
+.br
+.F /n/alice/usr/td/Monetary.units
+.br
+.F /usr/lib/Units.bin
+.SH BUGS
+Since
+.I units
+does only multiplicative scale changes,
+it can convert Kelvin to Rankine, but not Centigrade to
+Fahrenheit.
+.br
+Currency conversions are only as accurate as the most recent report of
+foreign exchange prices from the AP wire.