This is a beautiful explanation, thank you! It's also compatible with barbegal's hydraulic pressure analogy elsewhere in the discussion. A liquid- or gas-fille

This is a beautiful explanation, thank you! It's also compatible with barbegal's hydraulic pressure analogy elsewhere in the discussion. A liquid- or gas-filled tank feels pressure (i.e. force per area) on the walls as the fluid "wants" to either (1) flow to a lower gravitational potential energy location, for a liquid tank in a gravitational field, or (2) expand in volume, in the case of a pressurized gas tank.