1 When the last tube is filling, remove the tourniquet. 2  Remove the needle from the patient's arm using a swift backward motion. 3  Place gauze immediately on the puncture site. 4  Apply and hold adequate pressure to avoid formation of a hematoma.
Thermal Diffusivity. a physical parameter of a substance that characterizes the rate of change of its temperature in transient thermal processes. Thermal diffusivity is a measure of the thermal-inertia properties of a substance. It is numerically equal to the ratio of the substanceâs thermal conductivity and the product of its specific heat (at constant pressure) and density. Thermal diffusivity is expressed in m 2 /sec.
Thermal conductivity, k, is the property of a material's ability to conduct heat. Thermal conductivity is the fundamental property of a material which relates its ability to conduct heat.Heat transfer by conduction involves transfer of energy within a material without any motion of the material as a whole. Thermal conductivity and conductance are similar to electrical conductivity and electrical conductance. 2  Electrical conductivity or specific conductance is the reciprocal quantity, and measures a material's ability to conduct an electric current.