
Interpretation : Whether a person with body temperature of 400C is to be considered sick or not is to be determined and explained.
Concept Introduction : On a Celsius scale the melting temperature of ice is 00C and boiling point of water is 1000C. On the Fahrenheit scale, the melting temperature of ice is 320F and boiling point of water is 2120F.

Answer to Problem 7E
A person with body temperature of 400C is sick because on a Celsius scale, it is more than 370C which is considered to be normal body temperature.
Explanation of Solution
Given information:
A person has a body temperature of 400C.
A clinical thermometer is an instrument used to measure a person’s body temperature. It has a range of 350C to 420C. The normal body temperature of humans is considered to be 370C. Any temperature above 370C is considered to be abnormal. So, a person whose body temperature is 400C is sick as this temperature is more than normal body temperature.
The liquid used in clinical thermometer is mercury. The level of mercury in the glass tube indicates the temperature of the body.
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