Is there a simple formula for calculating air density if I know other variables like temperature, barometric pressure, humidity, and altitude?
Doug Hodgdon, Loveland, Ohio A: The formula is simple, it’s the gas law solved for density. But, getting the units correct, accounting for humidity in the air, and making barometric corrections all make it more complicated. The basic formula and what you need to do to make the corrections, using either the metric or American systems of measurements, are given in a new text we created to answer your questions. Click here to go to it. (3-31-97) Q: I was wondering if there is a conversion chart on the world wide web for correcting barometric pressure due to effects of gravity? Name and address not available A: Air pressure is caused by the force of gravity acting to pull molecules of the gases that make up the air toward the center of the earth. In other words, there is no “correction” to be made for gravity. I suspect you are really looking for the pressure corrections that are made to account for elevation or altitude. As you go higher the pressure decreases because there are fewer air
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