A solid block is fully submerged in a container of liquid. The block experiences an upward force (upthrust/buoyant force).
What is the physical cause of this upward force?
The pressure at the top of the block is greater than the pressure at the bottom.
The pressure at the bottom of the block is greater than the pressure at the top.
The density of the block is greater than the density of the liquid.
The volume of fluid displaced is less than the total volume of the block.