Common Pressure Units and Leak Rate Unit Conversions for Air Tightness Leak Testing

1. Pascal (Pa): the international standard unit; 1 Pa equals 1 N/m²

2. Kilopascal (kPa): 1 kPa equals 1000 Pa

3. Megapascal (MPa): 1 MPa equals 1000 kPa, or 1,000,000 Pa

4. Millimeter of mercury (mmHg): 1 mmHg is approximately equal to 133.3 Pa. It uses the height of a mercury column as the measurement standard, and is defined such that 760 mmHg equals standard atmospheric pressure.

5. Bar: 1 bar equals 100 kPa

6. Millibar (mbar, also known as hectopascal, hPa): 1 mbar equals 100 Pa

7. Pounds per square inch (psi): 1 psi is approximately equal to 6894.76 Pa, equivalent to a force of 1 pound per square inch.

8. Standard atmosphere (atm): 1 atm equals 101.325 kPa, commonly used for measuring gas pressure.

mL/s: milliliters per second. This is the most direct unit, representing the volume of gas leaked (in milliliters) within one second.

Pa·L/s: Pascal·liter per second. Indicates the leak rate requires pressure (Pascal) as the driving force.

cc/min: cubic centimeters per minute. 1 cc = 1 mL, so 1 mL/s = 60 cc/min

bar·L/s: bar·liters per second. 1 bar is approximately equal to 10^5 Pa

Flow rate units: such as cm3/(s・m), ft3/(min・ft), etc.

Conversion methods for different units: (using a leak rate of 1 mL/s as an example)

Milliliters per second (mL/s) = Cubic centimeters per minute (cc/min)  1 mL/s = 60 cc/min

Milliliters per second (mL/s) = Pascal-liters per second (Pa·L/s)    1 mL/s = 0.001 L/s × 105 Pa (assuming an applied pressure of 1 standard atmosphere, i.e., 105 Pa) = 100 Pa·L/s

milliliters per second (mL/s) <--> bar・liters per second (bar・L/s)  1 mL/s = 0.001 L/s× 1 bar

(1 bar is approximately equal to 105 Pa) = 0.001 bar · L/s

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