Hectolitre (hl or hL) – used to measure wine production The less commonly used prefixes with multiples and subdivisions between 1 / 10. Note that the examples merely illustrate typical usage and are not exhaustive. The table below includes the most commonly encountered prefixes based on multiples or subdivisions of 1000. They are recognised internationally and are independent of language. A standard set of symbols correspond to the metric prefixes (e.g. Prefixes are understood internationally.A few which are seldom used nowadays are related by the compatible numbers 10 and 100. Most of the prefixes are related by multiples of 1000.
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The multiples and subdivisions are related by a consistent structure that is easy to understand. If distinct names were used there would be a plethora of names to learn for each type of measurement. Only the set of prefixes need to be learned which can then be applied to any type of measurement. The names are easier to learn and remember.The two part name construction exposes the fundamental unit to which the named unit is referenced and by a factor which is encoded by the name itself. This minor inconvenience has to be weighed against the more important advantages which are: They do not exactly “trip off the tongue” or lend themselves to poetry. Some people criticise the metric system because of the long multisyllable names it gives rise to as a result of the prefixes. Traditional measurement units that were used before the metric system had their own distinct names like stone, pound and ounce for weight or yard, foot and inch for distance. Why use prefixes instead of distinct names? These prefixes can be applied to any fundamental metric unit like the metre for distance, the gram for mass or weight, the watt for power, and so on.
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Put another way, there are one thousand millimetres in a metre. So a millimetre is one thousandth of a metre. For example, the prefix “milli” means “one thousandth of”. Likewise, they can mean a fraction of a unit rather than a multiple. So “kilometre” means one thousand metres, and “kilogram” means one thousand grams. It consists of a partial word like “kilo” or “milli”.įor example, the prefix “kilo” means “times a thousand” or “one thousand of” the units in question. In metric that means multiplying or dividing by 10, 100, 1000, etc. A metric prefix is a convenient way of expressing mulitiples and subdivisions (larger and smaller) of any defined unit.