Question

what is meant by upthrust?​

Answer 1

it is the force exerted by fluids against immersion of objects in them which is perpendicular to the surface

Answer 2

✍️ THE UPWARD FORCE EXERTED ON A BODY BY THE FLUID IN WHICH IT IS SUBMERGED, IS CALLED THE UPTHRUST OR BUOYANT FORCE.

✍️ THE MAGNITUDE OF UPTHRUST ON A BODY DUE TO A LIQUID (OR FLUID) DEPENDS ON THE FOLLOWING TWO FACTORS :-

(i) Volume of the body submerged in liquid or fluid.

(ii) Density of the liquid or fluid in which the body is submerged.