Question:
what is difference between pressure exerted by gases and atmospheric pressure , can we say that balloon inflated by us is also example atmospheric pressure if yes then , why???
Answer:
Pressure -
Pressure is the amount of force per unit area that a gas exerts on a surface.
Gases and Liquids together are called fluids. However, liquid is a incompressible fluid which means density is constant with pressure change. However, gases are compressible fluid where density changes with pressure
Atmospheric pressure -
Atmospheric pressure is the pressure exerted on a surface by the weight of the atmosphere (a compressible fluid) above it and is usually measured using mercury barometer.
Gas pressure -
The pressure of a gas is the force that the gas exerts on the walls of its container. When you blow air into a balloon, the balloon expands because the pressure of air molecules is greater on the inside of the balloon than the outside. Pressure is a property which determines the direction in which mass flows. If the balloon is released, the air moves from a region of high pressure to a region of low pressure and the balloon deflates.
Gas Pressure is measured in mmHg (millimeters of mercury) with a barometer, which gives the barometric pressure. The standard atmospheric pressure is "the pressure exerted by a mercury column of exactly 760 mm in height when the density of mercury= 13.5951 g/cm3 (0 degrees C) and the acceleration due to gravity is also considered.
However, the SI unit for pressure is the pascal (Pa), which equals approximately 1 kg m-1 s-2. One atm equals 1.01325 x 105 Pa.
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