Bulk Modulus

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Bulk modulus defined as?

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1. **Elastic Moduli**: While Young's modulus relates to linear stretching, Bulk Modulus ($B$) relates to volumetric compression.
2. **Physics**: It is the ratio of volumetric stress (excess pressure $\Delta P$) to the volumetric strain (change in volume per unit volume $\Delta V/V$).
3. **Formula**: **$B = -\frac{\Delta P}{\Delta V/V}$**.
4. **Sign**: The negative sign is included because an increase in pressure ($ΔP > 0$) causes a decrease in volume ($ΔV < 0$), making the modulus itself positive.
5. **Relation**: Compressibility ($k$) is the reciprocal of Bulk Modulus ($k = 1/B$).

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Bulk Modulus

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