A thin-walled plastic bottle containing liquid rests on a horizontal bench. The combined weight of the bottle and the liquid is 18 N. The area of the bottle's base in contact with the bench is 24 cm2.
Calculate the pressure exerted by the bottle on the bench.
The liquid is poured out of the bottle. A student then connects the empty bottle to a vacuum pump and removes most of the air from inside it. As a result, the bottle is crushed inward.
Explain why the bottle is crushed. Use your ideas about gas molecules.
188 exam-style questions on CIE IGCSE Physics Pressure, covering Pressure. Each one has a worked solution and a mark scheme showing where the marks go.