Global Warming.

[ptc]

Dadpad.
I agree.

[SPIRIT]

change in the oceans currents is what will happen before the ice melts
some say it is already happening
you can aways find a scientist that need a pay check to say anything to keep thier grant to say mankind isn't changing the world climate is a joke
this done to keep the capitalism system on track (for how long )yes we all could do something about it parts of europe already have green parties in power this is because the globle change has a greater afect (acid rain l,, trees just dieing out )here in ozzie land we wont change until we have to ,sad but true , eg farming in a oz we have a thin layer of soil so we farm hard hoof animals (kangaroos much better opp bid deal about coat of arm thingy if we are going to eat meat do it right farmer have known(sorry been told) for 50 yrs that what they are doing is damageing the eco system so now we have been told for the larst what 25 yrs about g/w and still nothing is happening

just have to wait for a sea view

[Landseka]

Joe,

Aren't you confusing weight with specific gravity?, if you place ice in a container of water I would of thought the level of the water has to rise as the ice melts. The volume of ice above the water line turns to liquid and its new specific gravity has it settling in with the water.

Not so. The water level will actually fall. This is because as water freezes it expands so a cubic inch of water when frozen will occupy more than a cubic inch of space.

Even allowing for the bit floating above the water surface the level will still fall as the block melts.

Regards

Neil.

[joe greiner]

Neither one. A pound of water weighs a pound. A pound of ice weighs a pound. The ice is in equilibrium. Water level can't tell the difference. (Apologies for Imperial measurements)

I'm not suggesting acceptance of outlying experts who recommend doing nothing. I'd just like to see the arithmetic about sea level rise. That said, sometimes it's necessary to soften the truth to get folks attention. See for example Churchill's "Bodyguard of Lies." (Not quite the same, but you get the idea.)

Joe

[echnidna]

Bob, the Artic might be all ice and the theory is relevant.
But
The Antartic is a continent covered with ice.
When that ice melts it must run into the sea
so it seems there could be sea level rises.

Hoiwever if the climate is warmer there will be more evaporation so we might end up with more clouds, so the effect on sea level is not accurately predictable.

[Eddie Jones]

Neither one. A pound of water weighs a pound. A pound of ice weighs a pound. The ice is in equilibrium. Water level can't tell the difference. (Apologies for Imperial measurements)

I'm not suggesting acceptance of outlying experts who recommend doing nothing. I'd just like to see the arithmetic about sea level rise. That said, sometimes it's necessary to soften the truth to get folks attention. See for example Churchill's "Bodyguard of Lies." (Not quite the same, but you get the idea.)

Joe

Not right either.

It's not to do with weight, but volume. You are correct, the WEIGHT stays the same, but when water freezes it's VOLUME increases. It's weight stays the same, but it gets bigger. Conversely, when it thaws, the water in an iceberg has LESS volume than when frozen, so the total volume of the sea in which it lives becomes less.

Makes sense to me.

[silentC]

the water in an iceberg has LESS volume than when frozen

Yeah but about 10% of that volume is out of the water when it's frozen, so have you factored that in? If the difference is more than 10%, the sea level falls, if the same, equilibrium, if less, sea level rises.

[silentC]

According to Wikipedia, ice is about 8% less dense than water. So when it melts, the volume of the water that was once in the iceberg reduces by 8%. So 8% of the volume that was above water is cancelled out giving a net increase of volume now in the ocean of 2%.