Which of the following principles states that 'when a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it'?

In a fluid, the buoyant force acting on a submerged or floating object always acts _________.

A ship floats on water because:

When an empty plastic bottle with an airtight stopper is pushed deeper into a bucket of water, the increasing upward force that resists the downward push is known as __________.