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Cold is the presence of low temperature, especially in the atmosphere. In common usage, cold is often a subjective perception. A lower bound to temperature is absolute zero, defined as 0.00 K on the Kelvin scale, an absolute thermodynamic temperature scale. This corresponds to −273.15 °C on the Celsius scale, −459.67 °F on the Fahrenheit scale, and 0.00 °R on the Rankine scale.
Since temperature relates to the thermal energy held by an object or a sample of matter, which is the kinetic energy of the random motion of the particle constituents of matter, an object will have less thermal energy when it is colder and more when it is hotter. If it were possible to cool a system to absolute zero, all motion of the particles in a sample of matter would cease and they would be at complete rest in this classical sense. The object would be described as having zero thermal energy. Microscopically in the description of quantum mechanics, however, matter still has zero-point energy even at absolute zero, because of the uncertainty principle.

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  1. T

    Distance between cold pipe cross over hot

    Hello I need to cross over an existing copper hot water pipe with a cold 15mm mains copper pipe. Is there a standard I need to adhere to in terms of clearance?
  2. M

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  3. markmanningnz

    Hot water cold after weekend away

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  4. S

    Shower valve issue. Hot and cold mixed up.

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  5. I

    Thermal Store Heating Up Cold Feed Pipe

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  6. E

    Aqualisa Quartz 9.5kw Electric Shower - Only getting cold water?

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  7. Zach054

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  8. C

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  9. @

    Cold water supply to a bathroom washbasin in a modern flat?

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  10. M

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  11. @

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  12. G

    Boiler firing when the cold water is turned on

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  13. R

    Unvented cylinder no cold water to multiple outlets

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  14. R

    Tankless - Cold Water Hamer Sound with Cold Line Spring Check Valve

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  15. Mandarin

    Low cold water pressure in only one part of the house :(

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  16. M

    Heat pump unvented install balanced cold

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  17. B

    Cold water feed pipe leak

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  18. M

    15/22mm cold feed to boiler

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  19. chloeradhsaw

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  20. B

    Removal of cold water tank for bathroom taps?

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