Question 1

What is 1 atmosphere in PSI?

Accepted Answer

1 atmosphere equals approximately 14.696 PSI.

Question 2

What is bar pressure?

Accepted Answer

1 bar equals 100,000 pascals and is approximately equal to atmospheric pressure at sea level.

Question 3

What is the difference between gauge and absolute pressure?

Accepted Answer

Absolute pressure is measured from perfect vacuum (0 Pa). Gauge pressure is measured relative to atmospheric pressure. Absolute = Gauge + Atmospheric. A tire at 32 psi gauge has about 46.7 psi absolute.

Question 4

Are torr and mmHg the same?

Accepted Answer

They are nearly identical. 1 torr is defined as exactly 1/760 of a standard atmosphere (133.322 Pa), which is practically equal to 1 mmHg. The difference is less than 0.000015%.

Ksi to Bar

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