Page 57 - Science Course 1 (Book 2)
P. 57
Mo8-L3b: How Do We Use Thermal Energy?
Coolant in a refrigerator moves thermal energy from inside to outside the refrigerator.
Expansion Valve
Coolant Vapor
Condensor Coils
Heat into
room
The coolant, which begins as a liquid, passes through an expansion valve and cools.
As the cold gas f ows through pipes inside the refrigerator, it absorbs thermal energy from the refrigerator
compartment and vaporizes.
Key Concept SUMMARY
How Do We Use Thermal Energy?
What are the Uses of Thermal Energy?
A refrigerator keeps food cold by moving ther-
How does a refrigerator keep food cold?
mal energy from the inside of the refrigerator
out to the refrigerator’s surroundings.
49
