Which law states that at constant temperature the pressure of a given amount of gas in inversely proportional to the volume of the gas? combined gas law gay-lussac’s law charles’s law boyle’s law ideal gas law

Boyle's law shows that, at constant temperature, the product of an ideal gas's pressure and volume is always constant. It was published in 1662. It can be determined experimentally using a pressure gauge and a variable volume container. It can also be found through the use of logic; if a container, with a fixed number of molecules inside, is reduced in volume, more molecules will hit the sides of the container per unit time, causing a greater pressure.  

As a mathematical equation, Boyle's law is:  

P_1 V_1=P_2 V_2