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
Molar volume sample is a mixture containing "N" components, the molar volume is complex. It can be simply the sum of the individual components, and calculated using: But this is violated by many liquid-liquid mixtures. For instance mixing pure ethanol into pure water causes a "decrease" in the volume calculated by this formula. This effect is called "excess volume". For ideal gases, the molar volume is given by the ideal gas equation; this is a good approximation for many common gases at standard temperature and pressure. The ideal gas equation can be rearranged to give an expression for the molar volume of