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Definition of Upthrust

Babylon English Dictionary

upward push; raised area of land (Geology)
Upthrust Definition from Language, Idioms & Slang Dictionaries & Glossaries
hEnglish - advanced version

n : (geology) a rise of land to a higher elevation (as in the process of mountain building) [syn: upheaval, uplift, upthrow]

WordNet 2.0

1. (geology) a rise of land to a higher elevation (as in the process of mountain building)
(synonym) upheaval, uplift, upthrow
(hypernym) rise, rising, ascent, ascension
(classification) geology
Upthrust Definition from Science & Technology Dictionaries & Glossaries
Dictionary of Automotive Terms
The upward force produced when an object is immersed in a liquid or gas.
Upthrust Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In science, buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus a column of fluid, or an object submerged in the fluid, experiences greater pressure at the bottom of the column than at the top. This difference in pressure results in a net force that tends to accelerate an object upwards. The magnitude of that force is proportional to the difference in the pressure between the top and the bottom of the column, and (as explained by Archimedes' principle) is also equivalent to the weight of the fluid that would otherwise occupy the column, i.e. the displaced fluid. For this reason, an object whose density is greater than that of the fluid in which it is submerged tends to sink. If the object is either less dense than the liquid or is shaped appropriately (as in a boat), the force can keep the object afloat. This can occur only in a reference frame which either has a gravitational field or is accelerating due to a force other than gravity defining a "downward" direction (that is, a non-inertial reference frame). In a situation of fluid statics, the net upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body.

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