1500 millilitres of fluid should the average adult take in each day.
Fluid
A fluid is any liquid, gas, or other material that constantly deforms (flows) in response to an external force or shear stress. They have zero shear modulus, or, to put it another way, are substances that are unable to resist any shear force.
Although the term "fluid" typically refers to both the liquid and gas phases, different scientific disciplines have different definitions of the term. Some substances can be both fluid and solid depending on the field, and viscoelastic fluids like Silly Putty seem to behave like solids when a sudden force is applied. Definitions of solid also vary.
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