Units of measurement

Units of Measurement

Units of Measurement (pronunciation: /ˈjuːnɪts ɒv ˈmɛʒərəmənt/) are a standardised quantity of a physical property, used as a factor to express occurring quantities of that property. The etymology of the term comes from the Latin "unitas" meaning "one" and the Middle English "measurment" from "measure".

Units of measurement were among the earliest tools invented by humans. Primitive societies needed rudimentary measures for many tasks: constructing dwellings of an appropriate size and shape, fashioning clothing, or bartering food or raw materials.

Types of Units

Units of measurement can be broadly divided into the following types:

Physical Units: These are the units used to measure physical quantities such as length, mass, time, electric current, temperature, luminous intensity and amount of substance. Examples include the meter, kilogram, second, ampere, kelvin, candela and mole.

Derived Units: These are units that are derived from the seven base units. Examples include the newton for force, joule for energy and watt for power.

Non-SI Units: These are units that are not part of the International System of Units (SI) but are still in use. Examples include the minute, hour, day, degree of arc, hectare and litre.

Imperial Units: These are units that were historically used in the British Empire and are still in use in the United Kingdom and other countries that do not primarily use the metric system. Examples include the inch, foot, yard, mile, pound, ounce and gallon.

US Customary Units: These are units that are currently used in the United States and are somewhat similar to the Imperial Units. Examples include the US gallon, US quart, US pint, US cup, US fluid ounce, US teaspoon and US tablespoon.

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Units of measurement