In the mid-19th century, the prevailing theory was spontaneous generation, which claimed that living organisms could arise from non-living matter. Pasteur's famous experiment disproved this theory.
Here's a simplified explanation:
1. Pasteur used swan-neck flasks, which had a long, curved neck that allowed air to enter but prevented dust particles from reaching the broth.
2. He boiled broth in these flasks, killing any existing microorganisms.
3. The broth remained sterile for a long time in the swan-neck flasks, even though air could enter.
4. When he tilted the flasks, the broth contacted the dust particles trapped in the neck. This led to the rapid growth of microorganisms.
This experiment demonstrated that microorganisms do not spontaneously generate in broth. Instead, they are introduced from the environment, likely through dust particles. This was a major breakthrough in understanding how life arises and led to the development of the germ theory of disease.
