force per unit area, pressure, pressure level - the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit); "the compressed gas exerts an increased pressure" vital sign - sign of life; usually an indicator of a person's general physical condition...
STP - Standard Temperature and Pressure - is defined by IUPAC (International Union of Pure and Applied Chemistry) as air at 0oC (273.15 K, 32oF) and 105pascals (1 bar). STP - commonly used in the Imperial and USA system of units - as air at 60oF (520oR, 15.6oC) and 14.696 psia...
In SI units, pressure is measured in pascals; one pascal equals one newton per square metre. Atmospheric pressure is close to 100,000 pascals. ideal gas lawAccording to the ideal gas law, when a gas is compressed into a smaller volume, the number and velocity of molecular collisions ...