Get the pressure definition in science. See its units and get example of pressure and how to calculate it.

# Measurement

Learn how to convert days to years by two easy methods. See an example unit conversion and a table of values.

## How to Convert Days to Years

See how to convert ounces to grams in an easy one-step conversion. Or, just see a table of ounce to gram conversions.

## How to Convert Ounces to Grams – 1 Step Conversion

Learn what an exact number is in chemistry, physics, and math. Get the definition and examples of exact numbers.

## What Is an Exact Number? Definition and Examples

See how to convert meters to yards and back again. Get easy examples for converting 100 yards and 100 meters.

## Meters to Yards – Easy Length Conversion

See how to convert PSI to atm or pounds per square inch to atmospheres. This is a common pressure conversion in science and engineering.

## PSI to atm – Pounds per Square Inch to Atmosphere ...

Learn about the number of meters in a mile and learn how to convert meters to miles. Get a table of common unit conversions.

## How Many Meters in a Mile – Meters to Mile ...

Learn what a derived unit is, get examples, see a list of metric derived units of measurement.

## What Is a Derived Unit? – Definition and Examples

Learn how to convert degrees to radians and back again. This is a key angle conversion in geometry and trig.