Gas Law

Hofmann’s method In this method, a known mass of the liquid is allowed to evaporate in the vacuous space above the mercury column in a…

Regnault’s method The method is based on the measurement of the mass of a known volume of gas under the definite condition of temperature and…

Dumas’ method It is used for substances which are liquid at room temperature. The apparatus is shown in (Figure: Dumas’ method for determination of density…

The principle of cooling by adiabatic demagnetization was suggested by P. Debye (1926) and W. F. Giauque (1927). When a substance is placed in a…

Density of Gases in Molecular Mass The density of a gas is defined in Physical Chemistry as the mass in g of 1 L of…

Adiabatic expansion of cold compressed gas for liquefying gases enjoyed considerable popularity at one time for producing liquid air. The principle is that when a…

Joule-Thomson effect was utilized to liquefy gases. When a highly compressed gas is allowed to expand through a vale or throttle into a region of…

Cooling by rapid evaporation of volatile liquids depends on the fact that when the liquid evaporates it takes up its latent heat of evaporation from…

Freezing mixtures a mixture (as of salt and ice or of dry ice and acetone) for producing intense cold. Freezing mixtures are useful for producing…

Liquefaction of Gases — the Basic Principles Liquefaction of gases is an exercise that had attracted the attention of scientists from very early times. As…