SettingsSI units
Claude Émile Jean-Baptiste Litre
Claude Émile Jean-Baptiste Litre is a fictional character created in 1977 by Kenneth Woolner of the University of Waterloo in order to justify the use of a capital L to denote litres.
Claude Émile Jean-Baptiste Litre is a fictional character created in 1977 by Kenneth Woolner of the University of Waterloo in order to justify the use of a capital L to denote litres.
Defining equation (physical chemistry)
In physical chemistry, there are numerous quantities associated with chemical compounds and reactions; notably in terms of amounts of substance, activity or concentration of a substa...
In physical chemistry, there are numerous quantities associated with chemical compounds and reactions; notably in terms of amounts of substance, activity or concentration of a substa...
Defining equation (physics)
In physics, defining equations are equations that define new quantities in terms of base quantities.
In physics, defining equations are equations that define new quantities in terms of base quantities.
History of the metre
The livre was replaced by the decimal franc, and a new unit of length was introduced which became known as the metre.
The livre was replaced by the decimal franc, and a new unit of length was introduced which became known as the metre.
International System of Units
The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten.
The International System of Units is the modern form of the metric system and is generally a system of units of measurement devised around seven base units and the convenience of the number ten.
Length measurement
Length measurement is implemented in practice in an amazing variety of ways.
Length measurement is implemented in practice in an amazing variety of ways.
Microgram
In the metric system, a microgram is a unit of mass equal to one millionth of a gram, or 1/1000 of a milligram.
In the metric system, a microgram is a unit of mass equal to one millionth of a gram, or 1/1000 of a milligram.
Non-SI units mentioned in the SI
This is a list of units that are not defined as part of the International System of Units (SI), but are otherwise mentioned in the SI, because either the General Conference on Weights and Measur...
This is a list of units that are not defined as part of the International System of Units (SI), but are otherwise mentioned in the SI, because either the General Conference on Weights and Measur...
SI base unit
The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived.
The International System of Units (SI) defines seven units of measure as a basic set from which all other SI units are derived.
SI derived unit
These other units are called SI derived units, for example, the SI derived unit of area is square metre (m2), and of density is kilograms per cubic metre (kg/m3).
These other units are called SI derived units, for example, the SI derived unit of area is square metre (m2), and of density is kilograms per cubic metre (kg/m3).