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Что (кто) такое upthrust$88844$ - определение

UPWARD FORCE THAT OPPOSES THE WEIGHT OF AN OBJECT IMMERSED IN FLUID
Buoyancy force; Buoyant; Archimedes's Principle; Bouyancy; Buoyancy Force; Upthrust; Archimedes’ principle; Buoyant force; Bouyant force; Buoyant density; Center of buoyancy; Buoyant mass; Floating and sinking; Archemides' principle; Archimedes law; Bouyant; Buoyance; Buoyancy devices; Natant; Upthrow; Law of Flotation; Boyancy; Buoyancy principle; Principle of buoyancy; Hydrostatic lift; Law of flotation; Flotation (buoyancy)
  • The Galileo's Ball experiment, showing the different buoyancy of the same object, depending on its surrounding medium. The ball has certain buoyancy in [[water]], but once [[ethanol]] is added (which is less dense than water), it reduces the density of the medium, thus making the ball sink further down (reducing its buoyancy).
  • Approximation of an arbitrary volume as a group of cubes
  • Forces on an immersed cube
  • Pressure distribution on an immersed cube

Buoyant         
·vt & ·vi Bearing up, as a fluid; sustaining another body by being specifically heavier.
II. Buoyant ·vt & ·vi Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits.
III. Buoyant ·vt & ·vi Having the quality of rising or floating in a fluid; tending to rise or float; as, iron is buoyant in mercury.
buoyant         
1.
If you are in a buoyant mood, you feel cheerful and behave in a lively way.
You will feel more buoyant and optimistic about the future than you have for a long time.
= cheerful
ADJ
2.
A buoyant economy is a successful one in which there is a lot of trade and economic activity.
We have a buoyant economy and unemployment is considerably lower than the regional average...
Analysts expect the share price to remain buoyant.
ADJ
3.
A buoyant object floats on a liquid.
This was such a small and buoyant boat...
ADJ
upthrow         
¦ verb (past upthrew; past participle upthrown) Geology displace (a rock formation) upwards.

Википедия

Buoyancy

Buoyancy (), or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column. Similarly, the pressure at the bottom of an object submerged in a fluid is greater than at the top of the object. The pressure difference results in a net upward force on the object. The magnitude of the force is proportional to the pressure difference, and (as explained by Archimedes' principle) is equivalent to the weight of the fluid that would otherwise occupy the submerged volume of the object, i.e. the displaced fluid.

For this reason, an object whose average density is greater than that of the fluid in which it is submerged tends to sink. If the object is less dense than the liquid, the force can keep the object afloat. This can occur only in a non-inertial reference frame, which either has a gravitational field or is accelerating due to a force other than gravity defining a "downward" direction.

Buoyancy also applies to fluid mixtures, and is the most common driving force of convection currents. In these cases, the mathematical modelling is altered to apply to continua, but the principles remain the same. Examples of buoyancy driven flows include the spontaneous separation of air and water or oil and water.

The center of buoyancy of an object is the center of gravity of the displaced volume of fluid.