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hoist(Noun) A hoisting device, such as pulley or crane. hoist(Noun) The perpendicular height of a flag, as opposed to the fly, or horizontal length, when flying from a staff. hoist(Noun) The vertical edge of a flag which is next to the staff. hoist(Noun) The height of a fore-and-aft sail, next the mast or stay.
The forces at work in buoyancy. Note that the object is floating because the upward force of buoyancy is equal to the downward force of gravity. In science, buoyancy (pronunciation: /ËbÉÉª.Énáµsi/ or /ËbuËjÉnáµsi/; also known as upthrust) 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.