atmospheric gas

Gas Relative % by Volume Nitrogen (N 2 ) 78.09 Oxygen (O 2 ) 20.93 Argon (A) 00.93 Carbon di oxide (CO 2 ) 0.032 Miscellaneous 0.02 Total 100.000 ..

In soda water bottles, the gaseous carbon dioxide exists in equilibrium with the carbon dioxide dissolved in water. When the soda water bottle is opened, the carbon dioxide dissolved in it escapes out rapidly with fizz. This is because, the soda bottles are sealed after adding carbon dioxide g..

. The mercury reservoir R is so adjusted that the mercury in the branch B of the U-tube is at a fixed reference mark E to keep the confined gas at a constant volume. Then, we read the height of the mercury in the A branch. The pressure of the confined gas is the difference of th..

) holds good at all pressures and temperatures. This is an idealized model. It works best at very low pressures and high temperatures, when the gas molecules are far apart and in rapid motion. It is reasonably good (within a few per cent) at moderate pressures (such as a few atmosphe..

The specific heat of a substance is the amount of heat required to increase the temperature of a unit mass of it through a unit temperature. Its units in cgs system are cal g -1 o C -1 . In mks system, it is measured in kilocal kg - 1 o C - 1 . The SI unit is J kg - 1 K - 1 . The above definition i..

Example 1: A gas occupies 500 ml at 40 o C and 800 mm pressure. What volume will it occupy at 353 o C and 600 mm pressure? Solution : P 1 = 800 mm P 2 = 600 mm V 1 = 500 ml V 2 = ? T 1 = 40 o C + 273 = 313 K T 2 = 353 o C + 273 = 626 K V 2 = 1333.33 ml New vol..

Liquid-Gas (vapour) Equilibrium - When a liquid is placed in an open container it disappears completely after some time. However, when the same liquid is placed in a closed container, even after a long period only a part of the liquid disappears. The obvious difference is that the vapours..

When the gas atoms in the discharge tube are at atmospheric pressure they collide with the electrons preventing them from reaching the anode. As no electrons reach the anode no current flows through the discharge tube. When the gas pressure is very low there are few h..

The micro-particles of toxic metals and SO 2 gas present in the polluted atmosphere get adsorbed on metal particles rendering them highly toxic. These are released by various metal-finishing operation..

Particles of a gas have large intermolecular spaces among them. By the application of pressure much of this space can be reduced and the particles be brought closer. Hence the volume of a gas can be greatly reduced. This is called compressing the gas (Fig.15.1)...