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Fluids (Liquids and Gases)

Liquids and gases are called fluids because they can be made to flow, or move. In any fluid, the molecules themselves are in constant, random motion, colliding with each other and with the walls of any container. The motion of fluids and the reaction to external forces are described by the Navier-Stokes Equations, which express a conservation of mass, momentum, and energy. The motion of solids and the reaction to external forces are described by Newton's Laws of Motion.

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Because it has more inter molecular space and less inter molecular force of attraction.So it can flow easily.
Hope it helps and pls mark as the best answer. :-)
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