It's getting windier. - Page 5

Raistlin · 08-01-2005, 03:06

Also spotted the fact that I had claimed that the density will increase as the water is heated

Still not sure about the maths though. Does it neccessarily follow that a decrease in density of (say) 6% will lead to an equal (6%) increase in volume? It seems to make sense but my head's a bit foggy

Oh, and sorry if it seems like the thread's been hijacked. It hasn't, well - not really anyway

handyman · 08-01-2005, 09:26

Quote:

In liquid water, the excited OH-stretch vibration has a lifetime of 0.26 ps at 298 K

I never knew that....

keithwalton · 08-01-2005, 10:37

A great way for visualising what happens to water and how pressure, volume and temperature affect each other are PVT diagrams. They may look abit odd and hard to grasp but they are really usefull. See google for examples of them, here's one ...
http://nebula.deanza.fhda.edu/physic...PVTdiagram.jpg

ian@huth · 08-01-2005, 10:39

Quote:

Originally Posted by Raistlin

Also spotted the fact that I had claimed that the density will increase as the water is heated

Still not sure about the maths though. Does it neccessarily follow that a decrease in density of (say) 6% will lead to an equal (6%) increase in volume? It seems to make sense but my head's a bit foggy

Oh, and sorry if it seems like the thread's been hijacked. It hasn't, well - not really anyway

A decrease in density of 6% will result in an increase in volume of around 6.38 %.

There are some statistics about this at http://www.simetric.co.uk/si_water.htm

More than 70 % of the Earth's surface is covered with about 1.36 billion cubic kilometers of water / ice of around 2% of this is in ice form.

No, don't think the thread has been hijacked at all, just developed into serious discussion on a very important subject.

The wind here is still rattling the windows round here, it's amazing how much it seems to make the double glazing in the patio doors bulge.

AndrewJ · 08-01-2005, 10:47

The old house I am staying in is taking a beating right now, few creaks and groans.

bopdude · 08-01-2005, 11:25

Well it was blowing a gale here not so long back, settled down a bit now, I like the storms / wind, just not the after effects

**Paul** · 08-01-2005, 11:55

I got up this morning to find one of my fence panels residing in next doors garden.

AndrewJ · 08-01-2005, 12:12

Beginning to window if the old rear windows are upto this beating...they due to be replaced around June.

nffc · 08-01-2005, 12:26

Quote:

Originally Posted by Richard M

Um, are you serious?
How would the sea level not rise?

And quite how you worked out that an ice cube melting in a glass of water would not raise the water level is beyond me, unless you watched it for so long that the water evaporated.
Hope that flameproof suit works well.

As he said, water is less dense than ice, so when the ice melts the same amount of molecules would still be there but they would occupy less space...

Mal · 08-01-2005, 12:31

About 6.00 this morning, the wind was so bad that my house was shaking and I can't ever remember that happening before.

BBKing · 08-01-2005, 12:39

Not been keeping up with this thread, owing to being mostly asleep, apart from being kept awake by first the wind and then the baby woken up by the wind, but has anyone pointed out that working out sea level rises due to changes in ice/water density is fairly irrelevant as one of the ice caps is largely on land? The rise in sea level thus comes from land-borne ice melting and running into the sea, and I can't see how that won't result in an increased sea level, and even if the other cap melting doesn't result in an increased sea level it will result in less solar reflection and thus have a warming effect which increases the rate of melting at the other cap and thus increases the sea level more.

nffc · 08-01-2005, 12:44

Quote:

Originally Posted by BBKing

Not been keeping up with this thread, owing to being mostly asleep, apart from being kept awake by first the wind and then the baby woken up by the wind, but has anyone pointed out that working out sea level rises due to changes in ice/water density is fairly irrelevant as one of the ice caps is largely on land? The rise in sea level thus comes from land-borne ice melting and running into the sea, and I can't see how that won't result in an increased sea level, and even if the other cap melting doesn't result in an increased sea level it will result in less solar reflection and thus have a warming effect which increases the rate of melting at the other cap and thus increases the sea level more.

Well that would obviously depend on the amount of ice that would melt, and the additional volume it would occupy!

Matthew · 08-01-2005, 12:45

It's been pretty windy here since last night. Luckly out fence has survive this beating so far, thought it would all be down when I got up, but not. The village I live in is in a dip but we still manage to get it here because I'm on the edge of the 'dip'.

ian@huth · 08-01-2005, 12:48

Had a good look round this morning and everything seems OK. Glad that I had the fencing replaced a couple of years ago with concrete posts and gravel boards and anti bulge fittings in the middle of the wooden panels at the bottom. When we had the old fence with wooden posts we had a few occasions when one or two panels came adrift in high winds. The problem was that we have a large wooded bank alongside the house which is our property and we have a six foot fence at the top of it to give some privacy to our back garden. It was some of those panels that tended to blow loose which was very dangerous as they tended to skim away at a tremendouse speedforty or fifty feet across to the road which was some 10 to 15 feet lower down. They would have killed somebody if they had been hit by one.

Looking out across the gardens there are quite a number of fence panels down in gardens where they still have the original fencing and a few sheds with their felting missing including my daughters.

dilli-theclaw · 08-01-2005, 12:55

I got woken up early this morning by the wheely bins being blown down the road.