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.
To decide whether the same method can be used to measure the specific heat capacity of a sample, the following factors that affect measurement during thermal diffusivity tests need to be analyzed: 1  Rise in temperature. 2  Laser pulse magnitude. 3  Reflection by other media. 4  Sample-related problems.