**Definitions:**

**Pound Per Square Foot** (abbreviations: **psf, or lb/ft2**): is a British (Imperial) and American pressure unit which is directly related to the psi pressure unit by a factor of 144 (1 sq ft = 12 in x 12 in = 144 sq in). Where, 1 pound per square foot equals 47.8803 pascals.

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

## How to Convert Pounds Per Square Feet to Atmospheres

*Example: How many Atmospheres are equivalent to 77.78 pounds per square feet?*

As;

1 pounds per square feet = 0.00047267423142553 Atmospheres

77.78 pounds per square feet = Y Atmospheres

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

Y equals 77.78 times 0.00047267423142553 over 1

(i.e.) Y = 77.78 * 0.00047267423142553 / 1 = 0.036764601720278 Atmospheres

Answer is: 0.036764601720278 Atmospheres are equivalent to 77.78 pounds per square feet.

*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 ) 28.86 psf

( ii ) 11.65 psf

( iii ) 33.61 psf