compressibility

noun, plural com·press·i·bil·i·ties for 2.

1. the quality or state of being compressible.
2. Physics. the reciprocal of the bulk modulus, equal to the ratio of the fractional change in volume to the stress applied to a body.

noun

1. the ability to be compressed
2. physics the reciprocal of the bulk modulus; the ratio of volume strain to stress at constant temperatureSymbol: k