Barg pressure is the pressure, in units of bars, above or below atmospheric pressure. The "g" at the end of the word indicates that the measurement is not absolute pressure, sometimes indicated by bara. According to The Engineering ToolBox, standard atmospheric pressure is, by definition, 1.01325 at sea-level and 0 degrees Celsius.Continue Reading
Physics defines pressure as force per unit area. Atmospheric pressure is due to gravity acting on the air that surrounds the Earth. This is the reason standard atmospheric pressure is defined at sea level. As elevation increases, there is less pressure due to the decrease in the weight of air.
According to HowStuffWorks, "Humans cannot live unprotected at pressures greatly above or below atmospheric pressure." Pressure also affects the boiling point of water, so recipes require adjustments for high altitudes. Underwater, the weight of water acts on a body to increase pressure, so it rapidly increases. Pressure acting on materials deep within the Earth helps to form metamorphic rocks.
Hydromechanics, the study of the effects of force on fluids, involves the study of pressure. According to Bernoulli's Principle, streams of both liquids and gases reduce pressure. According to Pascal's Law, changes in pressures transmit to all parts of a confined fluid while holding a constant temperature.Learn more about Measurements
A barometer is used to measure atmospheric pressure. Atmospheric pressure is a measure of the amount of force air exerts onto the earth as it is pushed down from the atmosphere. Another term for atmospheric pressure is barometric pressure.Full Answer >
Converting from SCFM to CFM is done by dividing the SCFM by the ratio of the actual pressure and atmospheric pressure multiplied by the ratio of standard room temperature and the actual temperature. This relationship is derived from the ideal gas law, which uses the absolute pressure reading and the absolute temperature scale.Full Answer >
To calculate the pounds per square inch (psi) from the compression ratio, one needs the compression ratio and the atmospheric pressure measurement. Then, the first number in the compression ratio is multiplied by the atmospheric pressure, then divided by the second number in the ratio.Full Answer >
At average atmospheric pressure, the expansion ratio between water in its liquid form and steam is 1:1700. This means that under ideal conditions, 1 part of liquid water expands to 1700 times the volume as steam when boiled.Full Answer >