The Nobel Prize in Chemistry 1931 was awarded jointly to Carl Bosch and Friedrich Bergius "in recognition of their contributions to the invention and development of chemical high pressure methods".
 

Everyone knows what happens when a bottle of carbonated water is opened: there is a "pop", and a gas, carbon dioxide, rushes out. According to the laws of chemical equilibrium it is generally true that if reduction in volume occurs during a chemical change in which gases are involved and if that change is due to the fact that the quantity of the gas or, in scientific language and more accurately expressed, the number of gas molecules is less after the change than prior to it, then the change, i.e. the yield of the product striven for, is promoted by the fact that pressure is exerted on the mixture of the various substances in which the change occurs. In this case, in fact, pressure promotes the change to a very great extent, because the volume of the mixture of nitrogen gas and hydrogen gas from which the ammonia is made, is here compressed to half. By taking this step, Haber had given rise to a new method of utilizing the nitrogen in the air, for which he has already been rewarded by the Nobel Prize for Chemistry.