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.
In physics, thermal conductivity (often denoted k, Î», or Îº) is the property of a material to conduct heat. It is evaluated primarily in terms of Fourier's Law for heat conduction.n SI units, thermal conductivity is measured in watts per meter kelvin (W /(m Â· K)). The dimension of thermal conductivity is M 1 L 1 T â3 Î¸ â1. These variables are (M)mass, (L)length, (T)time, and (Î¸)temperature. In Imperial units, thermal conductivity is measured in BTU /(hr Â· ft â Â°F).