• ← KnownUnitQ
• → QuantityMagnitude

Quantity

WMA link

Quantity[magnitude, unit]

represents a quantity with size magnitude and unit specified by unit.

Quantity[unit]

assumes the magnitude of the specified unit to be 1.

• • Quantity["Kilogram"]

• • Quantity[10, "Meters"]

If the first argument is an array, then the unit is distributed on each element

• • Quantity[{10, 20}, "Meters"]

If the second argument is a number, then the expression is evaluated to
the product of the magnitude and that number

• • Quantity[2, 3/2]

Notice that units are specified as Strings. If the unit is not a Symbol or a Number,
the expression is not interpreted as a Quantity object:

• • QuantityQ[Quantity[2, Second]]

Quantities can be multiplied and raised to integer powers:

• • Quantity[3, "centimeter"] / Quantity[2, "second"]^2

Quantities of the same kind can be added:

• • Quantity[6, "meter"] + Quantity[3, "centimeter"]

Quantities of different kind can not:

• • Quantity[6, "meter"] + Quantity[3, "second"]