Re: moulins

Nic wrote:
On 3 Mar, 23:37, Robert Carnegie <rja.carne...@xxxxxxxxxx> wrote:
DougC wrote:
On Feb 21, 4:32�am, dsfn <bernard.w...@xxxxxxxxxxxxxx> wrote:
G'day,

� � � � � � �I was just wondering... have I got it right?.. the
glaciers d'ont actually have to melt to cause sea levels to rise. All
that"s needed is for the land based glaciers to slip into the sea? �If
that is true then how much time do we have left? Any answers?

Oops, I misspoke.  Ice shrinks in volume when it melts.  Actually,
when all the icebergs have melted the sea level will go down
slightly.

But that will be too late to save the Florida keys.

An iceberg displaces water (occupies sea-space) equivalent to the mass
of the iceberg itself, so I think the traditional answer is that it
makes no difference.  But I think the fact the sea is salt water,
which is denser than fresh, ought to make a difference too - only, I
can't figure what.  Well, let's try harder: the iceberg displaces its
mass in salt water, but when it melts, it produces its mass in fresh
water, which is a greater volume than the salt water.  So sea level
goes up?

That seems right to me. If the fresh water iceberg had been in a
plastic bag, then after the ice melted, you'd have a bag of fresh
water floating in brine, so a small part of it would be protruding
above the surface. If you then burst the bag, that small volume that
was protruding will get spread evenly in a thin layer on the surface.
So you are right. As the fresh water gets invaded by salt, it's
volume will decrease, but overall (without adding more salt) there
will be a greater volume of water in the sea.

At http://wiki.answers.com/Q/Why_is_salt_water_denser_than_normal_water
it is implied that if you add salt to, say, a litre of water, you get
slightly more than a litre, of denser salty water. I thought you just
got a litre, but I haven't done the experiment. (Which seems to
involve using food colourings as well, to show whether horizontal
layers of water at different temperature or salinity mix.)

No doubt this experiment also "proves" to believers how the biblical
flood created the Grand Canyon, Offa's Dyke and Finnegans Wake, but in
terms of flooding around the world's coasts, we may have reached the
point of counting the angels dancing on melting icebergs. If you add
water to the sea then the sea rises.

.

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