Pressure is a measurement of force per unit area. Atmospheres (atm) is a common unit when working with gasses and the pascal is the SI unit of pressure equal to one newton per square meter (N/m2). Pascal represents a very small pressure so the larger kilopascal (kPa) is used more often when working with larger pressures. This example problem shows how to convert atm to kPa units.
Example Problem:
The pressure at sea level is generally considered to be 1 atm. Pressure increases the deeper you dive in the ocean by roughly 1 atm every 10 meters. At a depth of 50 meters the pressure will be 5 atm. What is this pressure in kPa?
Solution:
The relationship between atm and Pa is:
1 atm = 1.013 x 105 Pa
The other relationship needed is the number of pascals in a kilopascals.
1 kPa = 1000 Pa
Multiply 5 atm by these conversion factors to calculate kPa.
? kPa = 506.5 kPa
Answer:
The pressure 50 meters underwater is equal to 506.5 kPa.
For further explanation of using conversion factors in this way, check out How to Convert Units and the Ladder Method.