So can pitch undergo chemical changes which make it start to melt at room temperatures?
So can pitch undergo chemical changes which make it start to melt at room temperatures?
New cutout fitted, but was a bit scary when they're using a blow torch to melt all the old pitch off the cables about 2 feet from the gas meter, they didn't upgrade it to PME (currently TT) but the cutout has space for it so i'd imagine it'll be ready for it should they decide to upgrade the earthing on our street
I thought old lead and paper could be converted to PME, isn't that right?
obviosly if the DNO wants to move her off TT and onto their earth
So can pitch undergo chemical changes which make it start to melt at room temperatures?
It's still there (well,was pretty recently), and continues to 'dribble'.As a kid (some 50 odd years ago) I remember seeing in the Science museum a large glass conical funnel into which a cube of tar had been placed, presumably some time before I was born. When I visited it the tar had started to 'dribble' down the neck of the funnel, so I think that under the force of gravity it will eventually flow albeit slowly even at room temperatures.
It would seem that glass 'flowing' is just folklore
http://en.wikipedia.org/wiki/Glass#Behavior_of_antique_glass[/QUOTE]
It may well be, but I've seen quite robust debates about it. What the wikipedia says is undoubtedly right - that the suggestion of degrees of flow visible to the naked eye over periods of a few hundred years is just a myth. However, I've seen people arguing that flow rates much slower than that may be theoretically possible.
Kind Regards, John.
That's one of the examples quoted in the wikipedia, but telescopes have only been around for a few hundred years. The suggestions I've seen are in relation to very small amounts of flow over tens of thousands or hundreds of thosands of years!How come old telescopes still work? If the glass had flowed even the tinyest amount, they would stop working.
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