Temperature ? a term that people use almost daily as a matter needless to say, without being made alert to the physical correlations. But how is the term temperature defined?
Everybody perceives temperature in their environment purely subjectively. If we have been too warm or too cold, it is a feeling, which may be different from individual to individual ? because not everyone gets cold at exactly the same speed. The word temperature ? or, better, the problem, that influences (among other things) our state of mind ? is discussed daily when 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 really a measure of the power of a body, that is generated by the random motion of its atoms or molecules within the body? Coward . Here, the temperature is the magnitude of circumstances which establishes the power content associated with other physical quantities (mass, heat capacity).
Temperature unit
The machine of temperature may be the Kelvin. At a temperature of 0 K, all atoms or molecules within a body are in rest ? all motion within the body is frozen. One describes this state as the absolute zero point. The Celsius temperature scale that is more common inside our latitudes defines the zero point because the freezing point of water, since this condition could be reproduced without great technical effort in past times.
Temperature measurement
Different physical properties are directly dependent on the temperature and thus are used for temperature measurement, such as for example, for example:
the dependence of expansion on temperature
the change in electrical resistance with temperature
voltage generation with respect to the temperature
temperature-dependent frequency fluctuations
changes in the wavelength of the radiation of a body, with regards to the temperature
Note
Information on our temperature measuring instruments can be found on the WIKA Website.