Which is also why, if the entire Artic ice shelf melts, the ocean level will
rise exactly zero feet.
This is not true of the Antarctic ice fields - they've got southern ice.
If the Arctic ice melts, however, the salinity of the oceans will change and
all the fish will DIE. Bathers will no longer have to worry about sharks,
true, but Pirana will be able to live in the ocean...
This is also true. Unfortunately, if the Arctic ice fields melt, then
so do the Antarctic ice fields, though there may be some short-term
(~10 year) anisotropy. And there is far more ice in the Antarctic than
in the Arctic -- about 8 times as much.
True, but beyond that, most things expand as they
Ice is one of the few solids that is less dense in
solid form than liquid form.
And that's a good thing, otherwise, lakes and oceans would
freeze from the bottom up.
And sunk objects displace water equivalent to their volume.
A boat full of iron ore has a density greater than that of water, else
it would not sink. Accordingly, the volume it displaces when sunk
is less than the volume it displaces when floating.
The level in the canal goes down.
Nope. The water level drops.
In the boat, the iron ore displaces a volume of water equivalent to its
weight. Once the ore sinks, it displaces only its own volume of water. As
water is significantly less dense than iron ore, the water level goes down.
You're confusing this puzzle with the one about floating ice cubes. Even Mr.
Wizard got that one wrong
But if the ore is more dense, it would not float in the first place by
itself. That is only a portion of the puzzle. The boat also had air
pockets, lighter material in the hull, etc. If all of it sinks and air
pockets remain, the level goes up.
If you took iron ore by itself, it would sink right away and raise the
level, but it never did float in the first place so it just moved water. .
On Tue, 18 Mar 2008 02:20:39 -0700 (PDT), monkey email@example.com
When I had roommates, it used to annoy me how they would fail to fill
up the ice cube trays after they used ice.
Eventually I got down to no roommates, but still they came in and used
Eventually I figured out that the ice was sublimating, going from
solid to gas without passing through a liquid state. It happens
whenever there is air above the ice, and if you don't use your ice for
weeks or months like me, it's very noticeable.
They make some ice-cube trays that are bottles with caps. I tried one
and it worked but the cubes were little balls, and too small.
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