bulk modulus

Question

Bulk modulus K represents resistance to:

RankGuru · Accepted Answer

Bulk Modulus ($B$ or $K$) measures a substance's resistance to uniform compression (changes in volume). It is defined as the ratio of hydraulic stress (pressure) to volumetric strain:
$K = - \frac{\Delta P}{\Delta V / V} = - V \frac{\Delta P}{\Delta V}$
- The negative sign indicates that an increase in pressure ($\Delta P > 0$) leads to a decrease in volume ($\Delta V < 0$).
- The reciprocal of Bulk Modulus is called **compressibility**. Solids have high bulk moduli, while gases have very low bulk moduli.

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Bulk modulus defined as?