Depression and addiction, for example, have several things in common, including: 1  Loss of interest in once-enjoyable activities. 2  Fatigue. 3  Feelings of hopelessness. 4  Reckless behavior. 5  Irritability.
Deflection Temperature Testing of Plastics. The deflection temperature is a measure of a polymer's ability to bear a given load at elevated temperatures. The deflection temperature is also known as the 'deflection temperature under load' (DTUL), 'heat deflection temperature', or 'heat distortion temperature' (HDT).
By definition âthe thermal conductivity of a substance divided by the product of its density and its specific heat capacityâ. 1  In simple word diffusivity signifies penetration .Thermal diffusivity means ,How fast or how easily heat can penetrate a object/substance. 2  Higher the diffusivity, greater the penetration.