If I partially fill a bottle with water (even cold water), add some soap, close it up and shake it; when I open I open it back up, it tends to spurt / hiss / generally act like it was under pressure all of a sudden, even though the total volume of liquid inside is still the same.
Why?
Please and thank you xxx
In: 12
When a bubble forms, it traps a certain volume of air from the ambient pressure. More specifically, a fixed mass of air.
The bubble’s walls do pull slightly on the air trapped in it, raising its pressure. This does change the volume of air, makes that air smaller that the air in the container.
That should mean the container picks of a small negative pressure, though.
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