Temperature ? a term that we use almost daily as a matter of course, without being made aware of the physical correlations. But how may be the term temperature defined?
Everybody perceives temperature in their environment purely subjectively. If we are too warm or too cold, it is just a feeling, which may be different from individual to individual ? because Teetering gets cold at exactly the same speed. The term temperature ? or, better, the problem, that influences (among other activities) our state of mind ? is discussed daily whenever we are discussing the expected temperature from the weather forecast with friends, acquaintances or colleagues.
Temperature
With the word temperature (from the Greek ?thermis? = warm), a specific thermal state of a body is described. Heat is a measure of the power of a body, which is generated by the random motion of its atoms or molecules in the body?s interior. Here, the temperature may be the magnitude of a state which establishes the energy content connected with other physical quantities (mass, heat capacity).
Temperature unit
The machine of temperature is the Kelvin. At a temperature of 0 K, all atoms or molecules within a body are in rest ? all motion in the body is frozen. One describes this state because the absolute zero point. The Celsius temperature scale that is more common in our latitudes defines the zero point as the freezing point of water, since this problem could be reproduced without great technical effort in past times.
Temperature measurement
Different physical properties are directly dependent on the temperature and therefore are used for temperature measurement, such as, for example:
the dependence of expansion on temperature
the change in electrical resistance with temperature
voltage generation depending on the temperature
temperature-dependent frequency fluctuations
changes in the wavelength of the radiation of a body, with regards to the temperature
Note
Info on our temperature measuring instruments are available on the WIKA Website.