In. hg. = standard atmospheric pressure (the average atmospheric pressure, per square inch of the atmosphere around the surface (sea level) of the earth).

1013.25 millibars

Explanation:

The standard atmospheric pressure that is measured formthe sea levels to the surface to the high altitudes of the earth is the 1013.25 millibar or is 17 pounds per inches as the air over the higher altitudes is more sensitive and it's measured in pascal. And are a function of the plant's mass and the radius of the surface and the amount of the distribution of the gases and the vertical distribution of the air. And hence is calculated by the values that are reduced to the mean sea levels.

Answerscripps institution of oceanography; i believe this is correct plz check first good luck;