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upthrust. 1  a thrust in an upward direction. 2  a sudden and forceful upward movement, as of a nation's economy or the stock market: Market observers are hoping the upthrust can be sustained. 3  Geology. an upheaval. 4  to thrust upward: Frost caused the ground to upthrust.
That is â. The upthrust on a body immersed in a fluid is equal to the weight of the fluid displaces by it. We have to derive upthrust or buoyant force to prove Archemedesâ Principle. image of upthrust. A cube A is immerged into a beaker filled with a liquid.hat is â. The upthrust on a body immersed in a fluid is equal to the weight of the fluid displaces by it. We have to derive upthrust or buoyant force to prove Archemedesâ Principle. image of upthrust. A cube A is immerged into a beaker filled with a liquid.