Atmospheric pressure is the pressure exerted by the weight of air in the atmosphere of Earth (or that of another planet). In most circumstances atmospheric pressure is closely approximated by the hydrostatic pressure caused by the weight of air above the measurement point.hus, a diver 10.3 m underwater experiences a pressure of about 2 atmospheres (1 atm of air plus 1 atm of water). Conversely, 10.3 m is the maximum height to which water can be raised using suction under standard atmospheric conditions.
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Trinity County, Texas. Trinity County is a county located in the U.S. state of Texas. As of the 2010 census, the population was 14,585.[1] Its county seat is Groveton.[2] The county is named for the Trinity River.