Question

What do you understand by the term upthrust of a fluid describe and explain experiment to show its existence.

Answer 1

Upthrust of a fluid is the force exerts by that fluid on the body floating in it. Larger the density of liquid larger is the upthrust.
for example
a boat floating on water

Answer 2

Answer:

upthrust of a fluid is the force exerts by that fluid on the body floating in it larger the density of liquid larger the upthrust