Pasteur experimented with the fermentation process and soon realised that the germs were being created during the process. He proved this through experimentation.
What did he do
He warmed water and allowed it to bubble into the bend of a connecting pipe. After cooling the pipe was broken and decay set into the water very quickly. Many doctors were still sceptical however. By 1867 though, Pasteur was able to demonstrate unequivocally that there was a link between germs, decay and disease.
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