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.
View More On Wikipedia.org
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.
View More On Wikipedia.org
-
R
Triton Eden Concentric Mixer doesn't turn to cold
Hi, Hopefully someone can shine a light on this! I have a Triton Eden Concentric Mixer Shower (shown below). For some reason the temperature control becomes increasingly stiff as you turn to the cold range, and I need to "flick" it around with a bit of force to get colder water. This has been... -
Shower allowing hot water into cold feed
Background: I have an outhouse with its own cold feed (with own stopcock). The hot feed into the outhouse is provided via a combi boiler in the main house - and therefore is controlled by the stopcock on the cold feed to the house. Therefore, to totally isolate both hot and cold water in the... -
P
Can a TMV fail on such a way as to create a 'short circuit' from cold to hot?
Hi, everyone - I hope someone can point out the obvious thing that I'm sure I've overlooked. I have a DHW problem. I have a 210 litre indirect cylinder (Megaflo) with secondary circulation. There are 9 'drops' off the hot loop - all at the far end of the loop. Not all of the pipe run is...- Philip Saunders
- Thread
- america circuit cold hot tmv usa
- Replies: 6
- Forum: USA
-
Combi conversion with gravity cold water
If a conventional system is changed to a combi boiler and the twin boost pump and CWST have been left in and working would it be an issue that gas safe can get involved with ? The mains hot water and tank fed cold water was running through pump and because pump stopped working cold water...- eagleeye
- Thread
- cold cold water combi conversion gravity water
- Replies: 3
- Forum: Central Heating Forum
-
M
Hot water from cold tap help
Hi I am getting hot water through the cold tap, could this be a TMV problem? TIA -
T
Noisy pipes on cold main
I am perilously close to losing my mind - so any help appreciated! About a month ago a vibrating sound started on our cold mains (copper pipes). This noise will often go on for 12-24 hours, always a loud rumbling sound that you can feel in the pipes. I am in a maisonette, and believe the cold... -
J
New boiler setup - hot and cold water cycles repeatedly
Hello - I recently got a new Worcester Greenstar 30i 30kW Combi Boiler 7733600005 installed in my property. Previously I had a 37KW combi boiler but that was 10 years old. But my plumber said that 30KW combi boiler should be more than enoguh. The day this was installed, I also had my water... -
M
Cold water storage tank bung
If there anything else that is safe to use to bung the outlet of a cold water storage tank. Could do. With some bungs tomorrow but most places can only get. Hold of them next day. Thanks -
Cold Shower/ No Hot Water
😒😒😒 Hello there, we have a Bristan Bliss electric shower, yesterday morning it was working fine, my husband and my daughter both had a shower no problem. We had a plumber round to relocate our bath pipes and sink pipes & to fit the new toilet, ready for our new bath and sink to be fitted, but...- will-i-am-sam
- Thread
- america cold cold shower hot hot water no hot water shower urgent usa water
- Replies: 4
- Forum: USA
-
K
I cant find the cold water valve shut off
Please see the pics. I can not find the cold water shut off valve. Just trying to replace the tap in my bathroom and want to shut off the hot and cold water. Hot water is off now. The left valve on the pics is the hot one and logically the right should be cold one. Its just not turning... -
B
Do I need a check valve on cold feed pipe
Hi everyone, I am looking for advice as under my kitchen sink their are two pipes, the cold water feed and hot water feed, the hot water feed has a check valve/NRV fitted on the copper pipe (I am not sure which kind of valve it is but it has an arrow on it) but the cold water feed pipe doesn't... -
J
Worcester Greenstar 24i. Junior. Hot then cold.
If the bath top shower is used by turning on the cold tap first, then the hot supply, it will give a consistent short shower, but that is getting shorter day by day before it goes cold. If the hot is turned on first, then the cold, that will result in domestic supply going cold within a few...- JohnHuson
- Thread
- 24i cold greenstar hot junior worcester
- Replies: 5
- Forum: Central Heating Forum
-
S
Boiler turning cold in middle of use
Hello, I have a valiant boiler ecotec 824 that was service about 4 months ago but has suddenly had a problem where the hot water for either the shower or the taps will run hot but flick between being luke warm and hot. The pressure is ok at 1.6bar. The temperature on the rads is low but water...- Spadez8
- Thread
- boiler cold middle turning
- Replies: 3
- Forum: Central Heating Forum
-
W
cold water storage tank in the loft has started to overflow.
The cold water storage tank in the loft has started to overflow. First post ever and not sure of my way around, I’ve listed my problem the way it happened My central heating system is a gas back boiler, been running fine for years. I usually use an electric immersion tank through the night on... -
A
Manifold hot cold plumbing
Hello again. I'm moving forward with my new-build project on, I need to plumb my 3 wet rooms up stairs, a downstairs loo and kitchen/utility. Due to lack of availability of a decent local plumber I'm doing the work myself. I wanted to use manifolds for hot and cold supplies. 22mm to feed the... -
I
Mixer Cold Tap Leaking from Top
Hi, I have a Tre Mercati Bridge Sink Mixer Tap. The taps are screw down. The cold water tap leaks from the top when turned on (the water wells up around the top). When off it then still tends to leak a little. I've taken it apart but the O rings all appear to be OK. I've taken some photos and... -
S
Penthouse flat, worst cold / hot water performance I’ve seen.
Hi everyone, I’ve just assessed a top floor penthouse with what’s best described as Sod poor water pressure (1 bar standing, 0.25bar working) at 8/9 lmin... it has a conventional heat only boiler and cylinder in the utility, cold water storage and CH feed tank are about 3m higher in a...- Southsealee
- Thread
- america cold flat hot hot water usa water worst
- Replies: 11
- Forum: USA
Creating content since 2001. Untold Media.
Newest Plumbing Threads
-
-
-
What constitutes a Commercial Appliance and thus a Commercial Kitchen?
- Started by FozzieBear
- Replies: 3
-
POTTERTON PROMAX 28 COMBI Boiler - Hot Water Issue
- Started by boiler101
- Replies: 4
-
Hole in copper pipe, solder under floor, T coupling & protection- Started by dreikher
- Replies: 0
-
-
-
-
-
-
-
-
-
Sewer pipe problems not sure about it- Started by sammie81116
- Replies: 3
-