|Pasteur also discovered that milk becomes sour because of
the presence of bacteria in it. He also showed that many of these bacteria
could be destroyed by the application of certain amount of heat. Thus milk
and milk products like butter etc. could be preserved for longer periods.
By this special method even, those germs which are responsible for causing
the tuberculosis could be eliminated. Bu discovering the method of elimination
and checking the growth of germs, Pasteur, besides finding cure for various
diseases also helped in preserving food items. The method of making milk
free of germs that Pasteur discovered is known as pasteurization method,
and it is practised everywhere in the world.