Combined gas law is a result of unification of Charles's law, Boyle's law and Gay-Lussac's gas laws. In isolation each of these laws relate one thermodynamic variable to another while holding everything else constant. For instance, Charles's law asserts that as long as pressure is held constant, volume and temperature are proportional to each other. Boyle's law states that pressure and volume are inversely proportional as long as temperature is fixed. Gay-Lussac's law postulates a proportionality between temperature and pressure at a constant volume. Combined gas laws is a direct consequence of these three laws, it states that product of pressure and volume divided by the temperature of the system is constant. Combined gas law wiki article
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