Boyle's law of the gas, and "k" is a constant. The equation states that the product of pressure and volume is a constant for a given mass of confined gas and this holds as long as the temperature is constant. For comparing the same substance under two different sets of conditions, the law can be usefully expressed as The equation shows that, as volume increases, the pressure of the gas decreases in proportion. Similarly, as volume decreases, the pressure of the gas increases. The law was named after chemist and physicist Robert Boyle, who published the original law in 1662. This relationship
Graham's law involve the movement of more than one gas. In the same conditions of temperature and pressure, the molar mass is proportional to the mass density. Therefore the rate of diffusion of different gases is inversely proportional to the square root of their mass densities. Let gas 1 be H and gas 2 be O. (This example is solving for the ratio between the rates of the two gases) Therefore, hydrogen molecules effuse four times faster than those of oxygen. Using the formula of gaseous diffusion, the ratio of rate of diffusion of NH and HCl gas was obtained practically as