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.
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kaurharjeet6699
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.
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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.