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Listen According to the combined gas law, the volume of a gas must always decrease when temperature (#1: increases/decreases) and pressure (#2: increases/decreases). If the temperature of a gas sample increases, with the number of molecules and volume remaining constant, the pressure exerted by the gas (#3: increases/decreases). As the number of molecules in a gas sample (#4: increases/decreases), temperature and volume remaining constant, the pressure exerted by the gas decreases.