What is barometric pressure in physics?

In the field of physics, the barometric pressure (which is also referred to as the atmospheric pressure) is the pressure contained within the Earth’s atmosphere. The standard atmosphere can be defined as a unit of pressure whose value can be equated to 1013.25 mbar or 101325 Pascals. The standard atmosphere is often denoted by the symbol ‘atm’. It is important to note that the unit of atmospheric pressure can be considered as equivalent to the mean of the sea-level atmospheric pressure on the planet Earth. Therefore, the atmospheric pressure of the planet Earth is approximately equal to 1 atm. In most cases, the atmospheric pressure can be closely approximated with the help of the hydrostatic pressure which is a result of the weight of the air above the point of measurement.

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