Which scientist’s work demonstrated that heating liquids can prevent spoilage by killing bacteria?

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Heating liquids to kill bacteria shows that microbes cause spoilage and that heat treatment can stop their growth. Louis Pasteur demonstrated this most clearly by showing that spoilage results from microorganisms present in the liquid or in the environment, not from some inherent property of the liquid itself. By pasteurizing beverages—heating them enough to kill the microbes and then cooling them in sterile conditions—he proved you can prevent spoilage while preserving the liquid’s qualities. His swan-neck flask experiments further showed that merely exposure to air isn’t enough to spoil a liquid; it’s microbial contamination that matters, and that contamination can be controlled with heat. This work helped establish germ theory, linking microorganisms to spoilage and disease. While Robert Koch later identified specific pathogens and Galen and the Hippocratic Oath represent earlier science and medical ethics, Pasteur is the one whose experiments tied heating to the prevention of spoilage through microbial killing.