This article will be permanently flagged as inappropriate and made unaccessible to everyone. Are you certain this article is inappropriate? Excessive Violence Sexual Content Political / Social
Email Address:
Article Id: WHEBN0000026876 Reproduction Date:
The International System of Units (SI) specifies a set of seven base units from which all other SI units of measurement are derived. Each of these other units (SI derived units) is either dimensionless or can be expressed as a product of (positive or negative, but usually integral) powers of one or more of the base units.
For example, the SI derived unit of area is the square metre (m^{2}), and the SI derived unit of density is the kilogram per cubic metre (kg/m^{3} or kg m^{−3}). The degree Celsius (see the table below) has a somewhat unclear status, and is arguably an exception to this rule. The names of SI units are written in lowercase. The symbols for units named after persons, however, are always written with an uppercase initial letter (e.g. the symbol for the hertz is "Hz"; but the symbol for the metre is "m").^{[1]}
Some other units such as the hour, litre, tonne, and electron volt are not SI units, but are widely used in conjunction with SI units.
Until 1995, the SI classified the radian and the steradian as supplementary units, but this designation was abandoned and the units were grouped as derived units.^{[2]}
Litre, Ampere, Force, Pressure, Mass
United Kingdom, Film, Video, Experimental film, Video art
Time, Mass, Ampere, Second, International System of Units
Kinetic energy, Space, Force, Mass, Matter
Talk radio, Sports radio, Cadillac, Michigan, Wkad, Wlxv
Blaise Pascal, Second, Metre, Newton (unit), International System of Units
Energy, International System of Units, Second, Metre, James Prescott Joule
Second, Ampere, International System of Units, Electrical resistance and conductance, Werner von Siemens