The Bulk Modulus is a measure of a material's resistance to uniform compression. It quantifies how much pressure is needed to change the volume of a substance. A higher bulk modulus indicates that a material is less compressible, meaning it requires more force to compress it. This property is important in fields like engineering and materials science, where understanding how materials behave under pressure is crucial. In practical terms, the bulk modulus can be calculated using the formula: K = -V \fracdPdV , where K is the bulk modulus, V is the volume, dP is the change in pressure, and dV is the change in volume. Materials like metals typically have high bulk moduli, while gases have low values, making them more compressible.