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dimensions
In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it. Thus a line has a dimension of one (1D) because only one coordinate is needed to specify a point on it – for example, the point at 5 on a number line. A surface such as a plane or the surface of a cylinder or sphere has a dimension of two (2D) because two coordinates are needed to specify a point on it – for example, both a latitude and longitude are required to locate a point on the surface of a sphere. The inside of a cube, a cylinder or a sphere is three-dimensional (3D) because three coordinates are needed to locate a point within these spaces.
In classical mechanics, space and time are different categories and refer to absolute space and time. That conception of the world is a four-dimensional space but not the one that was found necessary to describe electromagnetism. The four dimensions (4D) of spacetime consist of events that are not absolutely defined spatially and temporally, but rather are known relative to the motion of an observer. Minkowski space first approximates the universe without gravity; the pseudo-Riemannian manifolds of general relativity describe spacetime with matter and gravity. 10 dimensions are used to describe superstring theory (6D hyperspace + 4D), 11 dimensions can describe supergravity and M-theory (7D hyperspace + 4D), and the state-space of quantum mechanics is an infinite-dimensional function space.
The concept of dimension is not restricted to physical objects. High-dimensional spaces frequently occur in mathematics and the sciences. They may be parameter spaces or configuration spaces such as in Lagrangian or Hamiltonian mechanics; these are abstract spaces, independent of the physical space in which we live.
I'm not a plumber. I can't get my head round plastic waste pipe dimensions - there's so many of them? I get that 32 mm is 1.25" and 40 mm is 1.5" (internal diameters) but what's the difference between "solvent weld" and "compression" as far as compatibility is concerned?
For example, on a...
Hi all
Just managed to get a rothenberger rofrost turbo pipe freeze.
Went with the advise after considering bottled Co2 (thanks corbsy)
It was virtually for free - partly because it has no inserts
So im going to machine some and have some large round alloy bar here.
Can anyone measure the...
I am building a tiled boxed area for a wall hung toilet and recessed basin. When working out where to fit them in the space provided do you half the space and centre this in each half and that becomes the centre of the toilet and basin (llike a vanity unit) or do you make it so the 3 spaces are...
evening all , Ive been asked to price an ufh system for a complete downstairs of a big house with lots of different floor types and heights. So I was wondering if the likes of myson or polypipe have reps that do site visits as it's a right pain to do a drawing to email them them
thanks in advance
Hi all, a friend has just asked me to fit a small towel warmer in place of her old radiator in the bathroom. Problem is the old pipe work is 10mm bore and they are wider than the width of the towel warmer. She doesn't want the Lino ripped up so what's the neatest way of adapting the pipe work...
On a new build when First fixing the toilet waste for a close coupled toilet, on the first floor, so coming up through the floor boards in the center of where the toilet will be. Should it be brought up tight back to the wall? Will a bent pan connector reach far enough in to the room to reach...
Hello,
does the x-dimension for copper ALSO include plastic push-fit, OR is this known as the y-dimension?
ALSO, why (on a previous post) is the internal pipe fitting for LCS, 13mm; is this z-dimension standard or does it change on whether black- or white-heart fittings are used.
I haven't had...
I have a non-standard stopcock that needs replacing but I can't identify the size....
There is a smooth flexible black pipe coming from the mains but this is 21.35mm in outer diameter. It has compression fittings on that end, and on the 15mm end.
The current stopcock has a BS logo, 88...
Steve Newton
Thread
black
dimensions
identifying
pipe
replace
stopcock
Hello Everyone.
I have a plan for a downstairs bathroom showing one pipe leading from the soil and vent pipe, to a toilet and then onto a basin. Should I try to reduce the size of the pipe after the loo, or try to connect the basin to the 100mm pipe? Or could the drawing be wrong and should I...
Hi, all
As per thread title, can someone please help me by confirming the distance between the service pipes (pipe centres) that connect to the plumbing manifold on the Worcester Greenstar 30cdi combi. This information does not appear to be on the WB website.
Thanks.
plb
Thread
30cdi
centre
dimensions
manifold
pipe
plumbing
worcester
Hello, Has anyone got the x dimensions for the PP1 question in the NVQ level 2 college book. I've spent a day and a half on this and no one else has started it yet at college. So far i've only got 3 of the dimensions correct 2 for 32mm and 1 for 40 mm the soil pipe is hard cos you only get a 2-3...
ive been on a plumbing course for 9 weeks now and have not got a clue to do dimensions yet and is required alot for the practical side of it, basicly i need someone to give me abit of help just a short reply of the basics of it and some ways to practice at home, tutor has explained to me but to...
SPlumbing
Thread
dimensions
fitting
flow
head
pan
pipe
pipe diameter
pipes
plumbing
plumbing course
Hi I'm Cookie , just signed on to the site , can any explain x dimensions in laymans terms , please !
I'm 27 and doing C&G N.V.Q 2 ( part time ) , I dont get on well with my practical tutor and he spends most his time chatting to a woman pupil . I'm not stupid far from it I have passed all my...
hello,new to forum.
does anyone have a list of all the z dimensions for lcs and x dimensions for copper,if such lists exist. any help greatly appreciated,thanks.
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