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Temperature ( tem-per-uh-cher) is a physical quantity that expresses the degree of hotness or coldness of a substance. It is the manifestation of thermal energy, present in all matter, which is the source of the occurrence of heat, a flow of energy, when a body is in contact with another that is colder or hotter. Temperature should never be confused with heat.
Temperature is measured with a thermometer. Thermometers are calibrated in various temperature scales that historically have used various reference points and thermometric substances for definition. The most common scales are the Celsius scale (formerly called centigrade, denoted as °C), the Fahrenheit scale (denoted as °F), and the Kelvin scale (denoted as K), the last of which is predominantly used for scientific purposes by conventions of the International System of Units (SI).
The lowest theoretical temperature is absolute zero, at which no more thermal energy can be extracted from a body. Experimentally, it can only be approached very closely (100 pK), but not reached, which is recognized in the third law of thermodynamics.
Temperature is important in all fields of natural science, including physics, chemistry, Earth science, astronomy, medicine, biology, ecology, material science, metallurgy, mechanical engineering and geography as well as most aspects of daily life.

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  1. T

    How inefficient is this temperature pattern?

    We have a large kitchen/dining area and I've measured the temperature. It's an interesting pattern... up and down.. and up and down... even though the thermometer is set at a constant temp. No night time set backs or anything like that... just inertia. We have a GSHP and ancient controls (see...
  2. K

    Vaillant EcoFit Pure 835 Temperature Panel Control

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  3. C

    Outside sensor slope vs room temperature setpoint

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  4. B

    Central Heating cuts out when DHW reaches set temperature

    Hello, I hope someone can give some advice with this problem. I have a Vaillant ecoTec plus 418 with Drayton MA1 mid-position actuator, Drayton HTS3 cylinder stat, Honeywell DT90E room stat and Drayton LP522 controller. Boiler fires up reliably, but after it cuts out as soon as the DHW...
  5. L

    Outside temperature sensor - weather compensation. Viessmann

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  6. PeterCl

    Best shunt pump temperature

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  7. D

    Ariston Next Evo X SFT multipoint water heater. Temperature issues.

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  8. J

    What is the sound I hear when the shower gets up to temperature?

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  9. H

    Honeywell TRV low temperature

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  10. J

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  11. A

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  12. E

    Thermostat not reaching the temperature which I have set.

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  13. O

    Heating always on and reduced hot water temp

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  14. B

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  15. B

    Bristan mixer bar shower leaking from the temperature control

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  16. T

    Why are fan convectors meant to be on Constant Temperature circuits?

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  17. O

    Heatmiser slimline temp accuracy

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  18. C

    Lower flow temperature in vented HWC w/immersion heater weekly cycle?

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    • combedcloud22
    • Thread
    • immersion heater temperature vented cylinder
    • Replies: 0
    • Forum: Central Heating Forum
  19. V

    Megaflo- optimising temperature to get maximum efficiency

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  20. S

    Shower Temperature fluctuation

    Hi, I have a question and would appreciate some advice on a small Shower reno that I’ll be doing soon. It is an old house (1960) and want to replace the current taps with a mixer diverter and new taps. Have always been experiencing fluctuations in temperature (pressure OK) in the shower when...
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