Pressure is measured using many different units.
You can convert pressure measured in one unit to another unit by clicking Utilities and then Conversions.
Holding the Control key and typing q has the same result.
In the Conversions window select Pressure. If you can't see the word
Pressure in the Measurement Type box, hit the 
arrow key
a few times.
Click the unit you have in the Units From: box, and the units you want in the Units To: box.
Enter the number in the lower left box and click Convert.
This window shows that 1 Atmosphere is 1.013 25 bars.
The conversions are based on:
1 Atmosphere = 1.013 25 Bars = 14.695 949 4 pounds / square inch
1 Bar = 100 000 Pascals
1 gm/square millimeter = 100 gram/square centimeter = 1 000 000 grams / square meter
1 kilogram/square centimeter = 1000 grams / square centimeter
1 kiloPascal = 1000 Pascals
1 pound/square foot = 16 ounces / square foot
1 pound/square inch =144 pounds / square foot
1 long ton / square inch = 2240 pounds / square inch
1 short ton/ square inch = 2000 pounds / square inch
1 metric ton / square centimeter = 1000 kilogram / square centimeter