Understanding Refrigeration

Before the invention of refrigerators, which method was NOT commonly used to preserve food?

• Freezing

• Drying

• Burying in snow

• Salting

What happens to heat when a liquid evaporates?

• It is absorbed

• It doubles

• It is released

• It remains constant

Which of the following is NOT a component of a refrigerator?

• Heater

• Evaporator coils

• Compressor

• Expansion device

What role does the compressor play in a refrigerator?

• It cools the refrigerant

• It raises the temperature and pressure of the refrigerant

• It absorbs heat from the food

• It releases heat to the atmosphere

How does the refrigerant change as it passes through the condenser coils?

• It expands and heats up

• It turns into a gas

• It absorbs heat

• It cools and turns back into a liquid