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Bulk modulus is defined as -P / (ΔV/V). Therefore it can be negative. True or False?

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in Physics – Class 11 by (74.2k points)
Bulk modulus is defined as -P / (ΔV/V). Therefore it can be negative. True or False?

(a) True

(b) False

This question was posed to me in my homework.

This interesting question is from Solids Mechanical Properties topic in division Mechanical Properties of Solids of Physics – Class 11

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Correct answer is (b) False

Explanation: Bulk modulus is defined as the ratio of volumetric stress to volumetric strain. And volumetric stress is force applied per unit area which is pressure. Now, when pressure is applied on a body its volume decreases, therefore a minus sign is used to make bulk modulus positive. Hence, it is positive.

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