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Myths about metric or international system

Despite the use of the international system of units in British education for the last four decades there are widespread myths about the metric system.

Metric is a French plot
Truth: metric is the international system of units (SI) officially used by all countries apart from the United States, Myanmar and Liberia
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The metre is "wrong"
Truth: the metre is defined in terms of the distance travelled by light in a very precisely defined fraction of a second.
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Centimetres are not valid in SI
Truth: in the international system (SI) centi- is a standard prefix and metre is a base unit. Centimetres are therefore valid in SI.
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Metric requires decimal time
Truth: the second is an SI base unit. Minutes, hours and days are metric units.
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Metric means compulsory use of decimal numbers
Truth: metric usually uses decimal numbers but there are specific cases like angular measure or time when decimal numbers are not used.
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