![]() ![]() Outside the United States, the word "meter" is spelled " metre" and the word "liter" is spelled " litre." The SI units are used to construct all other units (these are called derived units). The metric-based Système International or SI units are used to standardize the report or calculation of scientific quantities: It follows from dimensional analysis that 1.0 dm 3 = 1.0 L. The volume ( V) of a cube that has length ( l) = 1.0 cm, width ( w) = 1.0 cm, and height ( h) is given by: The liter is not the SI unit of volume Volume is a unit derived from length. This will be discussed in the section on prefixes. It is then necessary to subdivide or expand our measurement unit. ![]() The metric system uses the following base units:įrequently the above units are too small or more often too large to appropriately scale the measured quantity. The English System unit of mass is the slug, which when multiplied by the acceleration of gravity (32 ft/sec 2) gives the weight in pounds. Strictly speaking, weight is the force ( F) associated with a given mass ( m) as it is accelerated ( a) by gravity: The terms mass and weight are often used interchangebly in chemistry.
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