TRG-TRC003-EN 9
notes
In this period we will discuss refrigerants, the substances used to absorb and
transfer heat for the purpose of cooling.
Ice can be used to preserve food. Because heat flows from a higher temperature
substance to a lower temperature substance, ice can be used in a frozen display
case to absorb heat from the relatively warm food, cooling the food. As the ice
absorbs heat, it melts and is drained away.
Used in this manner, ice is a coolant. It absorbs heat from the food and
transports the heat away from the food.

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period two
Refrigerants