This document discusses several gas laws: 1) The ideal gas law describes the behavior of ideal gases and allows calculation of pressure, volume, temperature, or amount using three of the variables. 2) Dalton's law states that the total pressure of a gas mixture is equal to the sum of the partial pressures of the individual components. 3) Raoult's law relates the partial pressure of a component in a liquid mixture to its mole fraction and vapor pressure when pure. 4) Henry's law provides an alternative to Raoult's law by relating the partial pressure of a dissolved gas to its mole fraction or concentration using an empirical constant.