Question

what are free surface

Answer 1

free space

noun

PHYSICS

space unoccupied by matter or, more particularly, containing no electromagnetic or gravitational field and used as a reference.

Answer 2

hello mate !

answer

In physics, a free surface is the surface of a fluid that is subject to zero parallel shear stress, such as the boundary between two homogeneous fluids, for example liquid water and the air in the Earth's atmosphere. Unlike liquids, gases cannot form a free surface on their own.

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