Watch this fascinating demonstration of air pressure at work. Notice how the egg vibrates as the heated air escapes around it, and how it gets smoothly pushed into the bottle by atmospheric pressure.

Why? Because of the many factors which affect atmospheric pressure. Pioneering scientists discovered atmospheric pressure (also known as barometric or air pressure) in the 17th century ...

As the hot steam cools and condenses to water, a vacuum is created inside the can and atmospheric pressure will crush it. 250 ml water to a 5 gallon can 20 min to boil, 1 or 2 min to collapse.