Question

two solid blocks are heated to the temperatures shown. the blocks are placed so they touch. which diagram shows the direction heat will flow?

Explanation:

Step1: Recall heat - flow principle

Heat always flows from a region of higher temperature to a region of lower temperature.

Step2: Identify temperatures

One block is at 8°C and the other is at 1°C. 8°C is the higher temperature and 1°C is the lower temperature.

Step3: Determine heat - flow direction

Heat will flow from the 8°C block to the 1°C block.

Answer:

The diagram with the arrow pointing from the 8°C block to the 1°C block shows the direction of heat flow.