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 203°C and the other is at 197°C. 203°C is higher than 197°C.

Step3: Determine heat - flow direction

Heat will flow from the 203°C block to the 197°C block.

Answer:

The diagram with the arrow pointing from the 203°C block to the 197°C block.