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Different units are often used to measure the same type of thing (for instance, length). Sometimes you want to convert to another unit, just to visualize the amount - for example, if you are accustomed to seeing lengths expressed in meters, you may have trouble understanding feet. Or perhaps the other way round. Also, when using formulae, units need to be compatible. As an example, in the formula commonly used for speed problems:

distance = speed x time

distance might be in meters, time in seconds, in which case speed must be in meters per second. If one of the units is incompatible, it must be converted first.

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