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Question 7 (20 points) A technician measured the hardness of the steel bar two times. For the first time, he measured the hardness. He heated

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Question 7 (20 points) A technician measured the hardness of the steel bar two times. For the first time, he measured the hardness. He heated the steel bar to a high temperature and wait for the steel bar to decrease the temperature to room temperature. The technician measured the hardness of the steel bar again. (a) Did the technician get the same hardness in both measurements? (5 points) Answer: (b) Please explain your point of view. (15 points)

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