Final answer:
The pressure in the propane tank is greater in Miami, Florida compared to Albany, New York because of warmer temperatures in Miami, following Gay-Lussac's Law where pressure is directly proportional to temperature.
Step-by-step explanation:
The pressure in a propane tank, such as the one Martin drives to deliver propane, is affected by temperature. According to Gay-Lussac's Law, the pressure of a gas in a closed container is directly proportional to its temperature when volume is constant. Since Miami, Florida, is generally warmer than Albany, New York, especially in December, the pressure in the propane tank would be greater in Miami due to the higher air temperatures. Additionally, higher temperatures can cause the gas to expand more than the tank itself, which can also contribute to an increase in pressure.