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temperature
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electricity
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light
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angle
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viscosity
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radiation
Prexes
The Units menu includes an entry that is not a unit category, namely, Prex. Selecting this option displays a
palette of prexes.
Y: yotta Z: zetta E: exa P: peta T: tera
G: giga M: mega k: kilo h: hecto D: deca
d: deci c: centi m: milli µ: micro n: nano
p: pico f: femto a: atto z: zepto y: octo
Unit prexes provide a handy way of entering large or small numbers. For example, the speed of light is
approximately 300,000 m/s. If you wanted to use that in a calculation, you could enter it as 300_km/s, with
the prex k selected from the prex palette.
Select the prex you want before selecting the unit.
Unit calculations
A number plus a unit is a measurement. You can perform calculations with multiple measurements providing
that the units of each measurement are from the same category. For example, you can add two
measurements of length (even lengths of dierent units, as illustrated in the following example). But you
cannot add, say, a length measurement to a volume measurement.
Unit calculations 491
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