Thermal Properties of Matter
What are Thermal Properties of Matter? ➢ Thermal Conductivity ➢ Thermal Conductance ➢ Thermal Resistance ➢ Thermal Mass ➢ Temperature ➢ Specific Heat Capacity ➢ U Factor ➢ Coefficient of thermal Expansion
Heat and Thermal Expansion Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin vibrating/moving more and usually maintain a greater average separation.
Temperature ➢ Temperature is a measure of the warmth or coldness of an object or substance with reference to some standard value. ➢ It is an objective comparative measurement of hot or cold. ➢ It is measured by a thermometer. ➢ Several scales and units exist for measuring temperature, the most common being Celsius (denoted °C; formerly called centigrade), Fahrenheit (denoted °F), and, especially in science, Kelvin (denoted K).
Thermometer and Temperature Thermometer is an instrument for measuring temperature, often a sealed glass tube that contains a column of liquid, as mercury, that expands and contracts, or rises and falls, with temperature changes, the temperature being read where the top of the column coincides with a calibrated scale marked on the tube or its frame.
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