Final answer:
As a propane tank empties, the pressure inside decreases following Pascal's law.
Explanation:
In the case of a propane tank, as it empties, the pressure inside the tank decreases. This is because the amount of gas molecules diminishes, leading to a reduction in the force exerted by the gas on the walls of the tank. Therefore, Pascal's law dictates that as the volume of gas decreases, the pressure also decreases.
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