Converting Atmospheres to Pressure Unit Bars

This example problem demonstrates how to convert the pressure units 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. Problem: The pressure under the ocean increases roughly 0.1 atm per meter. At 1 km, the water pressure is 99.136 atmospheres. What is this pressure in bars? Solution: 1 atm 1.01325 barSet up the conversion so the desired unit will be canceled out. In this case, we want ​the  bar to be the remaining unit.pressure in bar (pressure in atm) x (1.01325 bar/1 atm)pressure in bar (99.136 x 1.01325) barpressure in bar 100.45 bar Answer: The water pressure at a depth of 1 km is 100.45 bar.