The kilogram per cubic metre (symbol: kg·m
−3, or kg/m
3) is the unit of
density
Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematicall ...
in the
International System of Units
The International System of Units, known by the international abbreviation SI in all languages and sometimes pleonastically as the SI system, is the modern form of the metric system and the world's most widely used system of measurement. ...
(SI), defined by
mass
Mass is an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different ele ...
in
kilogram
The kilogram (also kilogramme) is the unit of mass in the International System of Units (SI), having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo colloquially. ...
s divided by
volume
Volume is a measure of occupied three-dimensional space. It is often quantified numerically using SI derived units (such as the cubic metre and litre) or by various imperial or US customary units (such as the gallon, quart, cubic inch). ...
in
cubic metre
The cubic metre (in Commonwealth English and international spelling as used by the International Bureau of Weights and Measures) or cubic meter (in American English) is the unit of volume in the International System of Units (SI). Its symbol is m ...
s.
Conversions
*1 kg/m
3 = 1 g/
L (exactly)
*1 kg/m
3 = 0.001
g/cm3 (exactly)
*1 kg/m
3 ≈ 0.06243
lb/
ft3 (approximately)
*1 kg/m
3 ≈ 0.1335
oz/
US gal
The gallon is a unit of volume in imperial units and United States customary units. Three different versions are in current use:
*the imperial gallon (imp gal), defined as , which is or was used in the United Kingdom, Ireland, Canada, A ...
(approximately)
*1 kg/m
3 ≈ 0.1604 oz/
imp gal (approximately)
*1
g/cm3 = 1000 kg/m
3 (exactly)
*1 lb/ft
3 ≈ 16.02 kg/m
3 (approximately)
*1 oz/(US gal) ≈ 7.489 kg/m
3 (approximately)
*1 oz/(imp gal) ≈ 6.236 kg/m
3 (approximately)
Relation to other measures
The density of water is about 1000 kg/m
3 or 1 g/cm
3, because the size of the gram was originally based on the mass of a cubic centimetre of water.
In
chemistry
Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds made of atoms, molecules and ions: their composition, structure, proper ...
, g/cm
3 is more commonly used.
See also
*
Gram per cubic centimetre
The gram per cubic centimetre is a unit of density in the CGS system, commonly used in chemistry, defined as mass in grams divided by volume in cubic centimetres. The official SI symbols are g/cm3, g·cm−3, or g cm−3. It is equivalent ...
References
External links
Official BIPM definition of the kilogram
{{DEFAULTSORT:Kilogram Per Cubic Metre
SI derived units
Units of chemical measurement
Units of density