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The process of conversion depends on the specific situation and the intended purpose. Some conversions from one system of units to another need to be exact, without increasing or decreasing the precision of the first measurement. It does not involve changing the physical configuration of the item being measured. It changes the measurement to convenient and workable numbers and units in the new system. It sometimes involves a slightly different configuration, or size substitution, of the item.

A conversion factor is used to change the units of a measured quantity without changing its value. Because of the identity property of multiplication, the value of a number will not change as long as it is multiplied by one. Also, if the numerator and denominator of a fraction are equal to each other, then the fraction is equal to one. So as long as the numerator and denominator of the fraction are equivalent, they will not affect the value of the measured quantity.

There are many conversion tools. They are found in the function libraries of applications such as spreadsheets databases, in calculators, and in macro packages and plugins for many other applications such as the mathematical, scientific and technical applications. There are many standalone applications that offer the thousands of the various units with conversions. Unsourced material may be challenged and removed. This article gives lists of conversion factors for each of a number of physical quantities, which are listed in the index. Distance light travels in vacuum in 365.

One full revolution encompasses 2π radians. 12 troy ounces equals one troy pound. This is based on the average Gregorian year. See above for definition of year lengths. One unit rpm equals one rotation completed around a fixed axis in one minute of time. A force capable of giving a mass of one kilogram an acceleration of one metre per second per second.