ISO 80000-3
ISO 80000-3:2006 is an ISO standard entitled Quantities and units – Part 3: Space and time, superseding ISO 31-1 and ISO 31-2. It is a part of the group of standards called ISO/IEC 80000, which together form the International System of Quantities.
The standard is divided into the following chapters:
ISO 80000-3:2006 assigns names and symbols to quantities and units of space and time, and defines these quantities and units. For example,
Other units of distance defined by the standard are the ångström (symbol Å) (10−10 m) and the nautical mile (1852 m). No symbol is given for the nautical mile.
The are (symbol a) is a unit of area equal to 100 square metres.
The litre (symbol L or l) is a unit of volume equal to 10−3 m3.
ISO 80000-3:2006 assigns names and symbols to quantities and units of space and time, and defines these quantities and units. For example,
Other units of time defined by the standard include the minute (1 min = 60 s), the hour (1 h = 60 min) and the day (1 d = 24 h). The year (1 a = 365 d or 366 d) is defined in an informative annex.
The standard acceleration of free fall is 9.806 65 m/s2.
Units of level defined by ISO 80000-3:2006 are:
The following CGS units are deprecated:
The following non-SI units are deprecated by the standard:
The following non-SI units are given for conversion. They are not deprecated by the standard:
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