Unit conversion factor

Definition

A unit conversion factor is a ratio that expresses how many of one unit are equal to another unit. It is used to convert measurements from one unit to another.

5 Must Know Facts For Your Next Test

1. Unit conversion factors are based on equivalencies between different measurement units, such as 1 inch = 2.54 cm.
2. They can be written as fractions, such as $\frac{2.54 \, \text{cm}}{1 \, \text{inch}}$ or $\frac{1 \, \text{inch}}{2.54 \, \text{cm}}$.
3. Multiplying by a unit conversion factor does not change the value of the quantity, only its units.
4. Common conversions in chemistry include converting between moles and grams using molar mass.
5. Dimensional analysis is a technique that uses unit conversion factors to solve problems involving measurements.

Review Questions

Related terms

Dimensional Analysis:

A method for converting one kind of unit into another using multiplication by appropriate conversion factors.

Molar Mass:

The mass of one mole of a substance, usually expressed in grams per mole (g/mol).

Equivalency: A statement that two quantities are equal when measured in different units, such as $1 \, \text{inch} = 2.54 \, \text{cm}$.