Mechanics, Heat, Oscillations and Waves

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Please note: CORRECTION. Between 16:50 and 18:30, there is an error in the definition of the bulk modulus. The bulk modulus is actually the negative of the quantity defined above. Also, the hydrostatic pressure is the negative one-third of the trace of the stress tensor. So, overall the bulk modulus is one-third of the definition given here. Apologies for the error.