Why Does Shaking Water + Soap Increase The Pressure In The A Closed Container?

Question

This has never made sense to me. If I put a drop or two of washing-up liquid (“Dish Detergent” in US English) in a plastic food container with water, and snap on the lid, then shake the container, the lid will try to pop off on its own. Or if I do it in a screw-top container like a bottle or a jar, when I go to unscrew the lid it will act like a carbonated beverage (pop!). Why?

In: 59

Answer 1

Here’s my $0.02 but honestly I don’t know. Tap water has dissolved air in it. To see for yourself fill a clear glass with water and leave it overnight then you’ll see some bubbles. Shaking it with washing-up liquid releases the dissolved air.