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A unit of volume is a unit of measurement for measuring volume or capacity, the extent of an object or space in three dimensions. Units of capacity may be used to specify the volume of fluids or bulk goods, for example water, rice, sugar, grain or flour.
To ease calculations, a unit of volume is equal to the volume occupied by a unit cube (with a side length of one). Because the volume occupies three dimensions, if the metre (m) is chosen as a unit of length, the corresponding unit of volume is the cubic metre (m 3). The cubic metre is also a SI derived unit. [16]
The litre, though not an official SI unit, may be used with SI prefixes. The most commonly used derived unit is the millilitre, defined as one-thousandth of a litre, and also often referred to by the SI derived unit name "cubic centimetre". It is a commonly used measure, especially in medicine, cooking and automotive engineering.
Half of a gill is a jack, or one-eighth of a pint. [2] But in northern England, a quarter pint could also be called a jack or a noggin, rather than a gill, and in some areas a half-pint could be called a gill, particularly for beer and milk. [3] [4] [5] In Scotland, there were additional sizes: [6] big gill = 1 + 1 ⁄ 2 gills (213.1 mL)
When that multiplier is one, the unit is called a coherent derived unit. For example, the coherent derived SI unit of velocity is the metre per second, with the symbol m/s. [1]: 139 The base and coherent derived units of the SI together form a coherent system of units (the set of coherent SI units). A useful property of a coherent system is ...
The first group of metric units are those that are at present defined as units within the International System of Units (SI). In its most restrictive interpretation, this is what may be meant when the term metric unit is used. The unit one (1) is the unit of a quantity of dimension one. It is the neutral element of any system of units. [2]
It may be that all English-unit derived capacity measurements are derived from one original approximate measurement: the mouthful, consisting of about 1 ⁄ 2 ounce, called the ro in ancient Egypt (their smallest recognized unit of capacity). [4] [5] The mouthful was still a unit of liquid measure during Elizabethan times. [6]
These include the SI unit cubic metre (m 3) and its divisions, in particular the cubic decimeter, more commonly called the litre (1 dm 3 = 1 L = 0.001 m 3), and the cubic centimetre, also called millilitre (1 cm 3 = 1 mL = 0.001 L = 10 −6 m 3). [23] The volume of a quantity of liquid is fixed by its temperature and pressure. Liquids generally ...