noun
bulk modulus; volume elasticity
Technical term in mechanical engineering and physics for the ratio of pressure increase to relative volume decrease.
水の体積弾性率は約2.2 GPaです。
The bulk modulus of water is about 2.2 GPa.
体積弾性率が大きい材料は圧縮されにくい。
Materials with a high bulk modulus are hard to compress.