**Definitions:**

**Pound Per Square Inch** (abbreviations: **psi, or lb/in2**): is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch.

**Atmosphere** (abbreviation: **atm**): is a unit of standard pressure, equal to 101325 Pa, or 1.01325 bar.

## How to Convert Pounds Per Square Inches to Atmospheres

*Example: How many Atmospheres are equivalent to 27.5 pounds per square inches?*

As;

1 pounds per square inches = 0.068065 Atmospheres

27.5 pounds per square inches = Y Atmospheres

Assuming Y is the answer, and by criss-cross principle;

Y equals 27.5 times 0.068065 over 1

(i.e.) Y = 27.5 * 0.068065 / 1 = 1.8717875 Atmospheres

Answer is: 1.8717875 Atmospheres are equivalent to 27.5 pounds per square inches.

*Practice Question: Convert the following units into atm:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 82 psi

( ii ) 97.5 psi

( iii ) 57.51 psi