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Define compressibility....

Define compressibility.

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(i) The reciprocal of the bulk modulus is called compressibility. It is defined as the fractional change in volume per unit increase in pressure.
(ii) From the equation `K = (sigma_(a))/(epsilon_(v)) = -(Delta P)/(Delta V)` we can say that the compressibility
`C = (1)/(K) = (epsilon_(v))/(sigma_(n)) = -(Delta V)/(DeltaP)`
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