Temperature ? a term that we use daily as a matter needless to say, without being made aware of the physical correlations. But how is the term temperature defined?
Everybody perceives temperature within their environment purely subjectively. If we have been too warm or too cold, this is a feeling, which may be different from individual to individual ? because not everyone gets cold at exactly the same speed. The term temperature ? or, better, the condition, that influences (among other things) our mind-set ? is chatted about daily when we are discussing the expected temperature from the weather forecast with friends, acquaintances or colleagues.
Temperature
With the term 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 in the body? Private . Here, the temperature may be the magnitude of a state which establishes the power content connected with other physical quantities (mass, heat capacity).
Temperature unit
The unit of temperature may be the Kelvin. At a temperature of 0 K, all atoms or molecules inside a body are in rest ? all motion in the body is frozen. One describes this state as the absolute zero point. The Celsius temperature scale which is more common inside our latitudes defines the zero point as the freezing point of water, since this problem could possibly be reproduced without great technical effort in past times.
Temperature measurement
Different physical properties are directly influenced by 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 temperature
temperature-dependent frequency fluctuations
changes in the wavelength of rays of a body, with respect to the temperature
Note
Information on our temperature measuring instruments are available on the WIKA Website.