Liquids have only one free surface. What does 'only one free surface' mean??
Answers
Answered by
34
The free surface of a liquid just means the surface that is in contact with air. Like the horizontal surface of water in a glass. Or the top of the ocean where boats float.
If you are on the topic of surface tension, then a soap bubble has two free surfaces, the outside and the inside. these are free surfaces that are in contact with air.
A bubble inside a liquid has one free surface. That's just the place that air is touching the liquid.
Similar questions