自じ由ゆう表ひょう面めん

noun

free surface

Technical term in chemistry and physics for a surface of a fluid that is not in contact with a solid boundary, such as the top surface of a liquid in an open container.

• 液えき体たいの自じ由ゆう表ひょう面めんでは、表ひょう面めん張ちょう力りょくが働はたらく。

  Surface tension acts on the free surface of a liquid.