Creating low pressure inside a plastic bottle crushes it | Pressure | Physics

The activity in this video demonstrates how a low pressure environment inside an enclosed space is dangerous. We first partially fill a bottle with boiling water. This drives air out of the bottle, replacing it with water and steam. Then we seal the bottle to prevent air from getting back into the bottle. As the bottle is cooled steam condenses to water and the pressure in the bottle drops significantly below the atmospheric pressure of the air outside. This difference in pressure crushes the walls of the bottle. This is the reason submarines have a maximum depth rating, if they go lower than their rating then the pressure exerted by the water will crush the submarine.

Видео Creating low pressure inside a plastic bottle crushes it | Pressure | Physics канала KClassScienceChannel