Answer to Question #103505 in Molecular Physics | Thermodynamics for Zawadi

Question

Sketch a variation of pressure with distance on a graph starting from low pressure to high pressure as the distance goes further

Answer 1

As we know,

Let the mass of the air particle is m,

$\rho=$ density of the air

g=gravitational acceleration

h=height

As we are moving towards the ground the density of the air particles are getting increase, due to the force of gravity, it applies the force to the lower particle.

We know that mass = $\rho A dx$

Weight of the air is =$\rho A dx g$

So, air pressure is $dP=\rho A g dx$

$\int_o^P dP=\int_o^h \dfrac{\rho A gdx}{A}$

$P= \rho gh$

So, density of air and the gravitational acceleration is depending on the medium.