Bulk modulus

![Influences of selected glass component additions on the bulk modulus of a specific base glass.[3]](/uploads/202501/19/SpiderGraph_BulkModulus2923.gif)
The bulk modulus ( or
) of a substance measures the substance's resistance to uniform compression. It is defined as the ratio of the infinitesimal pressure increase to the resulting relative decrease of the volume. Its SI unit is the pascal, and its dimensional form is MLT.