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To understand the formation of vapor from propane liquid, it's crucial to recognize that when liquid propane vaporizes, it expands significantly in volume. The vaporization process transforms the liquid into gas, and propane specifically has a considerable expansion ratio between its liquid and gas states.

For propane, the expansion ratio is about 270 to 1 under standard conditions. This means that one cubic foot of liquid propane will produce approximately 270 cubic feet of vapor when it transitions to the gaseous state. Therefore, if two cubic feet of liquid propane are released, you can calculate the volume of vapor produced by multiplying the cubic feet of liquid by the expansion factor.

In this case:

2 cubic feet of liquid propane x 270 (expansion ratio) = 540 cubic feet of vapor.

This calculation explains why the answer is 540. It's important for anyone studying this material to grasp not only the mathematical aspect but also the physical principles behind vaporization and the behavior of gases compared to their liquid counterparts.