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A rate is a fraction that compares two quantities measured in different units. If the denominator of the fraction is 1 unit, the rate is called a unit rate.
The unit for a rate is the unit for the numerator divided by the unit for the denominator. For example, speed = distance divided by time. If distance is measured in micrometres and time in hours, then the units for speed are micrometres per hour.
Nolume is measured in unit meter cubed, m3.
The measurement unit depends on the characteristic that is being measured.
It is one form of a unit rate.