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
Imagine a still water bottle. Pour some soap into it… what happens? Nothing really just soap chilling in the water. Now shake the bottle. You have bubbles. Those bubbles are pockets of gas that formed from the interaction of the soap and the water with a little bit of added kinetic energy. The increase in gas will increase the pressure. Now your water bottle has lots of pressure compared to the outside environment. When you pop open the lid the pressure escapes outward causing that spurting/hissing you referred to.
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