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 is a material property. It will not differ with the dimensions of a material, but it is dependent on the temperature, the density and the moisture content of the material. The thermal conductivity of a material depends on its temperature, density and moisture content.The thermal conductivity normally found in tables is the value valid for normal room temperature. This value will not differ much between 273 and 343 K (0 â 70Â° C).onductance Vs Conductivity. Conductivity (k) is a material property and means its ability to conduct heat through its internal structure. Conductance on the other hand is an object property and depends on both its material and thickness. Conductance equals conductivity multiplied by thickness, in units of W/mÂ²K.