what is fluid? define it
Answers
a substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid.
In physics, a fluid is a substance that continually deforms under an applied shear stress, or external force. Fluids are a phase of matter and include liquids, gases and plasmas. They are substances with zero shear modulus, or, in simpler terms, substances which cannot resist any shear force applied to them.
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A fluid is any substance that flows or deforms under applied shear stress. Fluids comprise a subset of the states of matter and include liquids, gases, and plasma.
Examples
All liquids and gases are fluids (air, water, oil).
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