Pressure, Acceleration, Volume, and Temperature are the four fundamental flow properties that define the condition of the fluid.
Fluids are any liquids, gases, or basically any materials that, whilst under stress, exhibit a continual shape-shift and are unable to withstand tangential forces at repose.
It can be defined as when there is a change in the surroundings of the liquid, they may be because of some changes like getting heat or temperature changes, change in the volume, the speed of flow increases or decreases, there is some sort of pressure exerted or released.
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