'Create unit values by sending #units: to a number.'
2 units: #inches.
2 inches

'You can add, divide, multiply, and subtract unit values.'
(2 units: #inches) / (3 units: #seconds).
(2/3) inches per second

'Adding or subtracting units does appropriate conversions.'
(14 units: #feet) + (10 units: #meters).
46.8083989501312 feet

'You can also explicitly convert values.'
(15 units: #miles) / (1 units: #hours)
	convertTo: (Unit meters / Unit seconds).
6.7056 meters per second

'You can use 'derived' units such as the newton.'
3 units: #newtons.
3 newtons

'You can expand such a value into base SI units.'
(3 units: #newtons) baseUnits.
3000 gram meters per square second

'To see kilograms rather than grams, factor with respect to kilograms.'
(3 units: #newtons) factor: Unit kilograms.
3 kilogram meters per square second

'Unit values can also be compared (provided they are dimensionally consistent.'
(1 units: #inches) < (3 units: #centimeters).
true

"Creating additional units is easy:"
| microfortnight |
microfortnight := PrefixedUnit
	prefixName: 'micro'
	unit: (DerivedUnit
		abbreviation: 'FN'
		name: 'fortnight'
		pluralName: 'fortnights'
		value: (14 units: #days)).
(1 units: microfortnight) baseUnits "value asFloat"
(756/625) seconds