Question

Define:. 1) fluid. 2 ) buoyant force

Answer 1

fluid is that which can flow in liquid and gas medium

buoyant force a upward force act on a body


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Answer 2

1. fluids 
A substance that has no fixed shape and yields easily to external pressure ; a gas or  a liquid. 
2. buoyant force 
buoyant force is an upward force exerted by a fluid , which opposes the weight of an object in the fluid. object immersed in water observes a loss in weight due to buoyant force.