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.
One such method is the measurement of thermal properties. The term thermal properties include specific heat, thermal diffusivity, thermal conductivity, and thermal inertia. Heat energy may be transferred in one of three ways: radiation, convection, and conduction.he higher the thermal diffusivity of a material, the faster it will pass heat energy from one point to another. Thermal conductivity, on the other hand, is a ratio of the flow of heat through a given thickness of material to the temperature difference across this thickness.