Bulk Modulus

Bulk Modulus

Bulk modulus measures resistance against change in volume.

### Formula

$$K=-\frac{Pressure}{Volume\ Strain}$$

### Expanded Form

$$K=-\frac{P}{\Delta V/V}$$

### Terminologies

- K → Bulk modulus.

- P → Pressure.

- ΔV → Change in volume.

- V → Original volume.

### SI Unit

$$Nm^{-2}$$

### Dimensions

$$[K]=[ML^{-1}T^{-2}]$$

### Conditions / Special Cases

Negative sign indicates volume decreases when pressure increases.

### Usage

- Used in fluid and compression problems.