Different liquids boil at different temperatures. Some need a great deal of heat to reach their boiling point to vaporize while others require very little.

When speaking of boiling a liquid, we immediately think of heating water in a pan on a stove and watching it bubble. The fact is that the boiling points of some liquids are so low that they vaporize far below room temperature.

In an imaginary experiment, if R-134A liquid refrigerant were placed in a tea cup, it would immediately vaporize, leaving a thick, heavy layer of frost on the cup. This would happen because the relatively high temperatures in the room would cause the liquid refrigerant, with a boiling point of -14.9°F (-26.1°C), to instantly vaporize. The refrigerant absorbs the heat required to boil from the closest object to it, the cup. When the cup gives up its heat to the liquid R-134A, it becomes extremely cold, causing the moisture in the surrounding air to condense on the cup surface and form a thick layer of frost.

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