This is a process of killing micro-organisms in liquids like milk and apple cider. Louis Pasteur, a French chemist, discovered bacteria and that it is killed by heat. Basically, Pasteurization involves heating a substance to a certain heat, and then maintaining that heat for a certain amount of time to destroy bacteria. This discovery and development changed the changed the healthiness of the time, as Pasteur also discovered that bacterias cause disease. This process is still used today to prevent the spread of disease from food or drink.
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