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cold

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. marco128

    Thermostatic Shower cold

    Hi, Recently noticed an issue with thermostatic shower that was determined to get sorted. The shower would drop (which got worse) and would not maintain temperature,due to water quality here and visible limescale in cartridges,decide to just replace entire shower for a nice new one. This...
  2. dingledow

    Cap off cold water running to shower via loft space?

    I’m doing a bathroom refit, and there’s some strange pipework design that I’d like some advice on, please. I want to remove the cold water pipe running through the loft space because I would rather avoid having a cold water pipe buried under the loft roll insulation. Instead, I’d like to reuse...
  3. Andy110983

    New Triton shower cold

    Hi, I had a Madrid 2 Triton shower, I had it for 6 years then one day it started to run cold, so I purchased a Triton Seville shower and changed them over, that was running great for 3 days and now that has gone freezing cold, any advice? Thank you
  4. C

    2 cold feeds to indirect hot water tank

    Hi, I am reinstating an indirect hot water tank and have 2 cold water feeds coming into it from the same supply. One of the feeds has a float valve but what ever was on the other has been removed. Why would there be 2 feeds to the top of the tank? Can I blank one off and just use the float valve...
  5. tigersb

    Cold Radiator and towel rail

    I have a caravan with a brand new heating system.The Valliant combi boiler is working fine but one radiator and one towel rail are stone cold.I have bled both and also tried to balance the radiators with no success.Even when I shut off all other radiators the problematic ones still don't heat...
  6. Crossfingers

    Cause of cold shower

    Hi I fitted a low pressure shower set when I had a low pressure open vented system, which has a very low pressure rating. I now have a combi boiler with good pressure. I was wondering if having a shower set with a too low pressure rating could cause predominantly cold water to come out? The...
  7. jamesa2487

    One Cold Radiator Downstairs

    Hi. I have one radiator downstairs that will just not get hot. If I disconnect the thermostatic valve then turn it on hot water comes through. When I reconnect it the radiator heats up for a couple of days then stops again. I have bleed the radiators / balanced. Any idea? Thanks
  8. B

    Cold Rad's & return cool on another rad

    Sorry I have sort of asked this before, tried professionals but not great 1st experience hence DIY attempt attempt again. 2 completely cold rad's, another one get pretty warm, flow pipe hot, return v.luke warm. (Both rad's I have manually flushed really well) Hot water works fine, boiler return...
  9. B

    Shower going cold, hot water supply gets cut off completely?

    I have a new shower that has worked fine, albeit with low hot water pressure, for a couple of months. Now it starts hot, but then goes cold completely, sometimes after a couple of minutes, sometimes after less than 30 seconds. Meanwhile, on the side of the bathroom sink, there are no issues...
  10. A

    Kitchen tap running hot and cold

    Hi all We have an issue with a kitchen tap it seems to run hot and cold or Luke warm all the the other taps in the house are fine it’s just this one tap. It is a mixer tap and the combi boiler is about 2 metres away. It’s a Worcester greenstar. Is this an issue with the tap itself or something...
  11. J

    Glow worm boiler running cold water

    Hi all We have a Glow Worm combi Ultracom 38cxi boiler fitted in our house, which has been running really well for the past 10 years. Recently we have had an issue with the shower and water taps suddenly running cold water when we have the taps set to hot, the water will keep going hot and cold...
  12. K

    how can i get a hot water tap in garden building with only a cold feed

    hi. i am putting a loo in my garden office but only have a cold water feed. can i get hot water without using one of those triton wall mounted mini electric heaters? eg is there an electric mixer tap or something i could use instead. saw something on amazon that maybe looked ok? cheers
  13. F

    Combined vent and cold feed

    Hi guys Is it normal for the cold feed pipe from the f&e tank to be combined with the open vent? The cold feed connects to a 22mm tee one end is the vent the other cold feed to rads I thought the vent connects to ch flow and the feed to ch return? Thanks in advance
  14. V

    No cold water in bathroom.indirect water supply.

    Hi.. I would appreciate your advice. I am not get any cold water on the bathroom. Just dribbles in the bath and toilet..none at all on the wash basin. The supply is from the cold water tank. Thank you.
  15. J

    How to drain cold water tank!?!

    Help! I’ve turned off the gate valve that supplies my toilet white goods. Now it won’t open. It’s turning but water not flowing through. I need to drain the cold tank to replace the gate valve but the cold tank goes to a pump and I when I turn off the water, no cold water comes through the taps...
  16. S

    Window seal and gaps need filling too cold

    My house seems to be freezing and my double pvc glazing windows were installed over 20 years ago. The window seals have seen better days and there's gaps in between the window frames and window. Not really done anything like this before as I am not a plumber or carpenter. Does anyone which...
  17. E

    New column rad cold devastated

    New double panel column radiator Cold Turned off all rads not helped Checked trv pin seems fine Locksheild i think is ok see pic sttached Its new so didnt need to flush Cant really balance because the only thing that is hot is the copper pipes So instructions came with it about how it...
  18. D

    Do I insulate beneath a raised cold water tank in loft?

    Hello. In this recent cold snap my loft has been getting condensation droplets form on the bitumen membrane. I had previously installed lap vents and minimised storage to improve air flow. The loft is well insulated apart form an area under the cold water tank. However my cold water tank is...
  19. D

    Do I insulate beneath a raised cold water tank in loft?

    Hello. In this recent cold snap my loft has been getting condensation droplets form on the bitumen membrane. I had previously installed lap vents and minimised storage to improve air flow. The loft is well insulated apart form an area under the cold water tank. However my cold water tank is...
  20. A

    TMV valve under bath with 22mm hot water and 15mm cold water mains

    The bath taps have 22mm inlets currently the cold water mains 15mm is fixed to the tap by a copper adapter 15mm to 22mm. The hot water is 22mm gravity fed. Is it ok to add a 15mm T to the cold water pipe and then add 22ml adaptor to the T to connect to a 22m TMV . I cannot find any TMValves...
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