You're operating a propane gas grill from a fuel tank that's located below the grill. This tank is half filled with liquid propane. As the grill consumes gaseous propane, the tank's temperature drops below room temperature. This refrigerating effect occurs because
A. heat naturally flows from a cooler object to a hotter object.
B. heat is needed to initiate and sustain combustion in the grill.
C. thermal energy is being used to convert liquid propane into gaseous propane in the tank.
D. heat naturally rises from the tank to the grill above it.
Answer:C
You're operating a propane gas grill from a fuel tank that's located below the grill. This tank is half filled with liquid propane. As the grill consumes gaseous propane, the tank's temperature drops below room temperature. This refrigerating effect occurs because
A. heat naturally flows from a cooler object to a hotter object. B. heat is needed to initiate and sustain combustion in the grill. C. thermal energy is being used to convert liquid propane into gaseous propane in the tank. D. heat naturally rises from the tank to the grill above it.