Which of the following statements about a spring balance and/or a chemical balance is not correct?

A. the chemical balance operates on the principle of moments
B. the spring balance operates on Hooke’s law
C. either may be used to measure the weight of a substance
D. the reading of a spring balance changes over the surface of the earth, while that of the chemical balance remains constant

Correct Answer: Option C

C. either may be used to measure the weight of a substance