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Temperature
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Temperature and heat are not the same phenomenon. Temperature is a measure of the intensity or degree of hotness in a body. Technically, it is determined by getting the average speed of a body's molecules. Heat is a measure of the quantity of heat energy present in a body. The spatial distribution of temperature in a body determines heat flow. Heat always flows from warmer to colder areas.
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Temperature is related with the kinetic energy of the molecules. The kinetic energy changes when the temperature changes. Temperature is defined as the translation of heath between two objects. The fundamental temperature scale is the one of Kelvin. The temperature scale of Kelvin depends of the absolute zero point. This is the point where the molecules do not move anymore, so they do not give warmth.
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Thermistor Instruments and Probes Thermistor Meters and Probes and other Temperature products are now available to order from the Cole Parmer Instrument Catalog. Click any Thermistor Meters and Probes category to view all models and products.
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"* Temperature is a measure of the tendency of an object to spontaneously give up energy to its surroundings. When two objects are in thermal contact, the one that tends to spontaneously lose energy is at the higher temperature."(Thermal Physics, Ch 1.)
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Temperature is expressed as the inverse of the rate of change of entropy with internal energy, with volume V and number of particles N held constant. This is certainly not as intuitive as molecular kinetic energy, but in thermodynamic applications it is more reliable and more general. This form of the temperature can be obtained from the thermodynamic identity.
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Temperature control is a mainstay of the process industries as well as critical in HVAC, food processing and R&D. There are many temperature process controls available from simple on-off thermostat type controls to multi-tasking software packages used in larger processes and manufacturing plants in the pharma, materials and manufacturing industries.
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