Temperature ? a term that people use almost daily as a matter needless to say, without being made aware of the physical correlations. But how may be the term temperature defined?
Everybody perceives temperature within their environment purely subjectively. If we are too warm or too cold, this can be a feeling, which may be different from individual to individual ? because not everyone gets cold at the same speed. The term temperature ? or, better, the condition, 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, that is generated by the random motion of its atoms or molecules in the body?s interior. Here, the temperature is the magnitude of a state which establishes the power content associated with other physical quantities (mass, heat capacity).
Temperature unit
The unit of temperature is the Kelvin. At In The Zone of 0 K, all atoms or molecules within a body are at rest ? all motion within the body is frozen. One describes this state because the absolute zero point. The Celsius temperature scale which is more common in our latitudes defines the zero point as 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 influenced by the temperature and thus are employed for temperature measurement, such as, for example:
the dependence of expansion on temperature
the change in electrical resistance with temperature
voltage generation with regards to the temperature
temperature-dependent frequency fluctuations
changes in the wavelength of rays of a body, depending on the temperature
Note
Info on our temperature measuring instruments can be found on the WIKA Website.