. . "In science, buoyancy (pronunciation: /\u02C8b\u0254\u026A.\u0259n\u1D57si/ or /\u02C8bu\u02D0j\u0259n\u1D57si/; 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. 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."@en .