- #1
KrisOhn
- 195
- 2
If you bring a pot of water to boil, you will notice that the bubbles form on the bottom surface of the pot. This seems to make sense intuitively as this is the hottest surface, so this would be where the boiling action starts.
When I was in school during a thermo lab we pulled a vacuum in a chamber filled with water to induce boiling. I noticed that when you do this the bubbles also form from the bottom surface of the chamber, leading me to think that this is maybe a phenomena caused by the pressure of the water, not from a heat source.
Can anyone shed some light on why this happens? Why does the boiling action not start from a random point in the vacuum chamber? Why does it not start from the surface?
When I was in school during a thermo lab we pulled a vacuum in a chamber filled with water to induce boiling. I noticed that when you do this the bubbles also form from the bottom surface of the chamber, leading me to think that this is maybe a phenomena caused by the pressure of the water, not from a heat source.
Can anyone shed some light on why this happens? Why does the boiling action not start from a random point in the vacuum chamber? Why does it not start from the surface?