# Bar to Atm - Converting Bars to Atmospheres Pressure

Worked Pressure Unit Conversion Problem

These example problems demonstrate how to convert the pressure unit bar (bar) to atmospheres (atm). Atmosphere originally was a unit related to the air pressure at sea level. It was later defined as 1.01325 x 105 pascals. A bar is a pressure unit defined as 100 kilopascals. This makes one atmosphere nearly equal to one bar, specifically: 1 atm = 1.01325 bar. But, sometimes you need to find the exact conversion.

## Helpful Tip Convert bar to atm

When converting bar to atm, the answer in atmospheres should be slightly lower than the original value in bars.

## Bar to Atm Pressure Conversion Problem #1

The air pressure outside a cruising jetliner is approximately 0.23 bar. What is this pressure in atmospheres?

Solution:
1 atm = 1.01325 bar
Set up the conversion to the desired unit will be canceled out. In this case, we want atm to be the remaining unit.
pressure in atm = (pressure in bar) x (1 atm/1.01325 bar)
pressure in atm = (0.23/1.01325) atm
pressure in atm = 0.227 atm
The air pressure at cruising altitude is 0.227 atm.

bar > atm
0.23 bar > 0.227 atm

## Bar to Atm Pressure Conversion Problem #2

Convert 55.6 bars into the atmosphere.

Use the conversion factor:

1 atm = 1.01325 bar

Again, set up the problem so the bar units cancel out, leaving atm:

pressure in atm = (pressure in bar) x (1 atm/1.01325 bar)
pressure in atm = (55.6/1.01325) atm
pressure in atm =54.87 atm

bar > atm (numerically)
55.6 bar > 54.87 atm

## Bar to Atm Pressure Conversion Problem #3

You can also use the bar to atm conversion factor:

1 bar = 0.986923267 atm

Convert 3.77 bar into atmospheres.

pressure in atm = (pressure in bar) x (0.9869 atm/bar)
pressure in atm = 3.77 bar x 0.9869 atm/bar
pressure in atm = 3.72 atm