diffusivity

noun Physics.

1. the property of a substance indicative of the rate at which a thermal disturbance, as a rise in temperature, will be transmitted through the substance.

noun

1. a measure of the ability of a substance to transmit a difference in temperature; expressed as the thermal conductivity divided by the product of specific heat capacity and density
2. physics
   1. the ability of a substance to permit or undergo diffusion
   2. another name for diffusion coefficient
3. another name for diffusion (def. 5)