A cubic metre of pure water at the temperature of maximum density (3.983 °C) and standardatmospheric pressure (101.325 kPa) has amass of1000 kg, or onetonne. At 0 °C, the freezing point of water, a cubic metre of water has slightly less mass, 999.972 kilograms.
A cubic metre is sometimes abbreviated tom^3,M3,m**3,cum,m3,CBM,cbm whensuperscriptcharacters ormarkup cannot be used (e.g. in some typewritten documents and postings inUsenet newsgroups). The "cubic metre" symbol is encoded byUnicode at code pointU+33A5㎥SQUARE M CUBED.[4]
^From 1901 to 1964 the litre was defined as the volume of one kilogram of purewater at 4°C and 760millimetres of mercury pressure: during this time, a litre was about1.000028 dm3. In 1964 the original definition was reverted to.
^The cubic centimetre is the base unit of volume of theCGS system of units. The colloquial abbreviations "cc" and "ccm" are not SI but are common in some contexts such as cooking,engine displacement and medicine.
