Gases do not have a free surface .Why?
Answers
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.
A free surface is the surface of a fluid that is subject to zero parallel shear stress,such as the interface 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.
Fluidized/liquified solids, including slurries, granular materials, and powdersmay form a free surface.
The particles in gas are much farther from each other, usually a farther length than the size of the particles, and move a lot The gas behaves like a liquid; the particles are moving but are still attracted to each other, so they still flow. Unlike a solid or a liquid, the gas will try to fill whatever container it is in, adapting its volume accordingly.
Since gases do not exhibit superficial tension phenomena (they have no defined shape or volume) they can not form on their own a free surface.
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