Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 3: Forces and energy - Question 89

This diagram shows a car engine. The engine block gets hot. Water flows through the engine in the direction shown by the arrows. Cold water enters the engine block through the bottom hose.



Hot water comes out of the engine through the top hose. The water is cooled as it passes through the radiator. The radiator is exposed to air at the front of the engine. Explain what happens to the thermal energy in the water as it passes through the radiator.