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 quantity of heat transmitted, due to unit temperature gradient, in unit time under steady conditions in a direction normal to a surface of unit area. Thermal Conductivity-k - is used in the Fourier's equation. 1  1 Btu/(hr oF ft2/ft) = 1 Btu/(hr oF ft) = 1.731 W/(m K) = 1.488 kcal/(h m oC).