In physics, a fluid is a substance that continually deforms (flows) under an applied shear stress. Fluids are a subset of the phases of matter and include liquids, gases, plasmas and, to some extent, plastic solids.
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Some articles on fluid:
... In a solid, shear stress is a function of strain, but in a fluid, shear stress is a function of strain rate ... which describes the role of pressure in characterizing a fluid's state ... relationship between shear stress, and the rate of strain and its derivatives, fluids can be characterized as one of the following Newtonian fluids where stress is ...
More definitions of "fluid":
- (adj): Subject to change; variable.
Example: "A fluid situation fraught with uncertainty"
- (adj): Characteristic of a fluid; capable of flowing and easily changing shape.
- (noun): A continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas.
- (noun): A substance that is fluid at room temperature and pressure.
- (adj): Affording change (especially in social status).
Example: "Britain is not a truly fluid society"
Famous quotes containing the word fluid:
“It is a mischievous notion that we are come late into nature; that the world was finished a long time ago. As the world was plastic and fluid in the hands of God, so it is ever to so much of his attributes as we bring to it. To ignorance and sin, it is flint. They adapt to themselves to it as they may; but in proportion as a man has anything in him divine, the firmament flows before him and takes his signet and form.”
—Ralph Waldo Emerson (18031882)
“Eye, gazelle, delicate wanderer,
Drinker of horizons fluid line;
Ear that suspends on a chord
The spirit drinking timelessness;
Touch, love, all senses;”
—Stephen Spender (19091995)
“In place of a world, there is a city, a point, in which the whole life of broad regions is collecting while the rest dries up. In place of a type-true people, born of and grown on the soil, there is a new sort of nomad, cohering unstably in fluid masses, the parasitical city dweller, traditionless, utterly matter-of-fact, religionless, clever, unfruitful, deeply contemptuous of the countryman and especially that highest form of countryman, the country gentleman.”
—Oswald Spengler (18801936)