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 …

A metre long narrow bore held horizontally (and closed at one end) contains a 76 cm long mercury thread, which traps a 15 cm column of air. What happens if the tube is held vertically with the open end at the bottom?

A metre long narrow bore held horizontally (and closed at one end) contains a 76 cm long mercury thread, which traps a 15 cm column of air. What happens if the tube is held vertically with the open end at the bottom?

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