Unit Definition

What Is a Unit in Science?

The meter, yard, inch, and centimeter are all units of length.
The meter, yard, inch, and centimeter are all units of length. wwing, Getty Images

Unit Definition

A unit is any standard used for comparison in measurements. Unit conversions allow for measurements of a property that have been recorded using different units (e.g.,centimeters to inches).

Unit Examples

The meter is one standard of length. A liter is a standard of volume. Each of these standards can be used to compare with other measurements made using the same units.