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Solid is one of the four fundamental states of matter (the others being liquid, gas, and plasma). The molecules in a solid are closely packed together and contain the least amount of kinetic energy. A solid is characterized by structural rigidity and resistance to a force applied to the surface. Unlike a liquid, a solid object does not flow to take on the shape of its container, nor does it expand to fill the entire available volume like a gas. The atoms in a solid are bound to each other, either in a regular geometric lattice (crystalline solids, which include metals and ordinary ice), or irregularly (an amorphous solid such as common window glass). Solids cannot be compressed with little pressure whereas gases can be compressed with little pressure because the molecules in a gas are loosely packed.
The branch of physics that deals with solids is called solid-state physics, and is the main branch of condensed matter physics (which also includes liquids). Materials science is primarily concerned with the physical and chemical properties of solids. Solid-state chemistry is especially concerned with the synthesis of novel materials, as well as the science of identification and chemical composition.

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  1. cyberfruits

    URGENT Solid fuel back boiler decommission

    Hi We have a vented oil-fired heating system with a coal fire back boiler, this is going to be changed to a sealed pressurized system tomorrow and I believe, they are decommissioning the back boiler. I have only discovered today there is no access to the water jacket, so will it be good enough...
  2. M

    Solid fuel (smokeless coal) efficiency

    A bit of an unusual topic, as these are very rare in the UK. I went back to Poland to commission, test and tune the 20kW solid fuel boiler and the domestic heat exchanger for the hot water tank (300litres). Old heating system with steel 2-inch pipes and cast iron segmented rads We were warned...
  3. C

    Solid fuel heating system problem

    I could really do with some advice. Bit of back history, I have a trianco thorncliffe solid fuel room heater it has a back boiler, my dad put the system in just over 30 years ago, everything was bought from the then local fire shop, installed with lots of advice from them, the system has worked...
  4. M

    Reverse circulation Solid Fuel

    I have a Rayburn running my CH and HW, when the boiler is lit, the gravity flow works as it should rises to the cylinder and drops back to the boiler...when the cylinder is hot enough the CH pump comes on and this is where it goes wrong. The pump seems to be pushing the cold radiator water up...
  5. J

    Solid fuel back boiler

    Hi Have a 4 port solid fuel back boiler, is the any disadvantages of capping two of the ports off, (eg top left bottom right) then using it as a two port for HW and heating with a injector Tee, only reason iam asking as would cut down on pipe work coming from boiler and just out of interest...
  6. J

    pump on solid fuel to overcome pipe drop

    Hi Looking at some time connecting my solid fuel boiler up to HW cylinder, problem i have is where cylinder is the first floor drops by about 350mm so can not get a continues rise in pipe work, attached should be a diagram i think would overcome this issue, can you see any issues with what i...
  7. A

    Convert from solid fuel to LPG with combi boiler

    Hi all, I've just moved into a new house, it current has a solid fuel burner (kiln dried logs and / or smokeless coal nuggets) that is used for heating the radiators and providing hot water. It's my father-in-laws house that we've moved into and he's told me it's "the best" way to heat the...
  8. L

    Gas pipe under/in solid floor

    Hi. I have been on the phone to the Gas Safe Register, who have pointed me a bit in the right direction looking for certain information. I am in a situation where I have had a water pipe burst under a solid concrete and tile floor. The gas and water pipes were laid right next to each other in...
  9. 2

    Floating vanity unit on solid non supporting wall.

    Hello, I have a 4inch solid block wall and thinking of changing my basin to a floating vanity unit. Without having to build a stud wall to hide the pipes, is it possible to track into the wall 1 &1/4 for the waste pipe and for the 1/2 inch hot and cold. The plumber I had in wouldn't do this...
  10. S

    old solid fuel Back Boiler leak?

    Hi everyone, im not sure if this is the right forum but here goes, So i have noticed after getting my chimneys cleaned out that the soot from my kitchen chimney is damp and it looks like my old solid fuel back boiler has a leak of some kind. the boiler was put in when the house was built in...
  11. T

    Fitting square outlet elbow to a solid wall. How best to secure?

    Hi all. I've got a square elbow outlet that I want to plumb in next to my wall tap. Might sound like a daft question but it's got a securing nut so o How on earth do I secure it to a solid wall. I could reposition to a stud wall that I have access to to screw secure but I don't really want it...
  12. Neville Hillyer

    Can I replace a flexible drain hose with a solid one?

    I have moved house and traced a flood to several pinholes in a washing machine extended flexible drain hose. I assume they were caused by a mouse since there are droppings nearby. I have no experience of washing machine hoses connected above sink traps but, apart from the leak, it appears to...
  13. C

    Any primatic cylinders suitable for a solid fuel fire?

    TLDR; Why are modern primatic cylinders unsuitable for use with an uncontrolled heat source? The scenario: I have a friend (really) that needs a new HW cylinder fitting. Currently there is a 40ish year old 36x18 primatic type cylinder in place (I assume that’s what it is as it is ‘self...
  14. B

    Solid fuel appliance linked by H2 control system to oil fired rayburn

    I am after advice about a heating system I am looking to put into a recently purchased house. Ideally I would like a multi fuel log burner something like a stovax Stockton 11 with a back boiler connected to an H2 control system and that connected to an oil fired rayburn 680K. I have sourced the...
  15. M

    Solid fuel central heating - no heat in radiators

    I have moved into a house that has a large wood burner connected to radiators for the whole house. The pipes go up into the attic and there is an overflow tank there. The radiators are not heating up at all. The pump comes on, but the water doesnt seem to get to the radiators. Also, theres a...
  16. J

    Best Solid fuel range for both cooking and heating .

    Bit of advice needed regarding replacing an old Stanley range .Solid fuel.I am trying to source a second hand solid fuel range to heat about 8 rads and also to cook on .My current old Stanley 8 just does the hot water and about four rads badly.No oven and never hot enough to even boil potatoes...
  17. W

    £1m solid gold toilet stolen

    https://www.telegraph.co.uk/news/2019/09/14/blenheim-palace-closed-amid-speculation-golden-toilet-has-stolen/ The police say they have nothing to go on
  18. CorgiDirect

    MEGA Summer Clearance Sale. Low, Low Prices on V12 & Solid Gear Footwear

    Are you ready for the heating season ? VIEW HERE
  19. A

    HEAT HERO High Efficiency open vented Solid Fuel Heating System

    Has anyone heard off or installed this system? I would appreciate any feedback! Heat Hero Gravity - heathero.ie
  20. C

    How to run heating and water pipes in new extension with solid floor

    Good morning guys, I’ve currently got some building work going on at home and it’s nearly time to run the heating pipes. The builders are laying a floor which will be hardcore, then sand, then insulation, the dpm and finished with concrete. My query is about the heating pipes. They’re talking...
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