This example problem demonstrates how to convert the pressure unit pounds per square inch (psi) to atmospheres (atm).
A bicycle tire is inflated to 65 psi. What is this pressure in atmospheres?
1 atm = 14.696 psi
Set up the conversion so the desired unit will be cancelled out. In this case, we want atm to be the remaining unit.
pressure in atm = (pressure in psi) x (1 atm/14.696 psi)
pressure in atm = (65/14.696) atm
pressure in atm = 4.423 atm
The average sea level air pressure is 4.423 atm.