barometric pressure

But an increase of barometric pressure condenses the gases of the mine, and restrains them within their sequestered limits.

When smoke rises in a straight line from chimneys, is it an indication of a high or low barometric pressure?

The chart applies at a barometric pressure of 30 inches, and, except for great accuracy, no correction is generally necessary.

But the weight of a given volume of air varies both with the barometric pressure and also with temperature.

Merely an area of low barometric pressure—an area where the air has become lighter than the air of surrounding regions.