There is a close relationship between confidence intervals and significance tests. Specifically, if a statistic is significantly different from 0 at the 0.05 level, then the 95% confidence interval will not contain 0.
U.S. National Library of Medicine(0.00 / 0 votes)Rate this definition: Air Pressure. The force per unit area that the air exerts on any surface in contact with it. Primarily used for articles pertaining to air pressure within a closed environment.
Air pressure is also called barometric pressure because barometers are used to measure it. (Related: How a mercury barometer works). The National Weather Service reports surface air pressure in inches of mercury, while air pressure aloft is reported in millibars, also known as hectopascals (hPa).