Question

We go high in the sky in aeroplane and take a water bottle and after drinking all the water, we close the water bottle very tightly. After reaching on ground what happens to water bottle and why?

Answer 1

When we land the bottle will be crushed. Do you know that at higher altitudes the pressure is low. When we compare the pressure at a plane in higher altitude with the pressure at earth surface, the pressure on the atmosphere is less. When we close the water bottle tightly from plane, the pressure in the bottle is smaller than the pressure on earth surface. When we land, pressure outside the bottle is higher than that of pressure inside the bottle. There is air outside the bottle pushing in at a higher pressure than the air inside the bottle is pushing out. So, the bottle can crushed.