## Category: Kinetic Theory

## A gas in equilibrium has uniform density and pressure throughout its volume . This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, its density decreases with height. The precise dependence is given by the so-called law of atmospheres

A gas in equilibrium has uniform density and pressure throughout its volume . This is strictly true only if there are no external influences. A gas column under gravity, for example, does not have uniform density (and pressure). As you might expect, Read More …

## From a certain apparatus, the diffusion rate of hydrogen has an average value of 28.7 cm3 s-1 . The diffusion of another gas under the same conditions is measured to have an average rate of 7.2 cm3 s-1 . Identify the gas. [Hint: Use Graham’s law of diffusion: R1 / R2 = (M1 /M2)1/2 , where R1 , R2 are diffusion rates of gases 1 and 2, and M1 and M2 their respective molecular masses. The law is a simple consequence of kinetic theory.]

From a certain apparatus, the diffusion rate of hydrogen has an average value of 28.7 cm3 s-1 . The diffusion of another gas under the same conditions is measured to have an average rate of 7.2 cm3 s-1 . Identify the gas. Read More …