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The old thread automatically closed is here: "Ask a physicist anything. (6)"
Well, it's a detail of the big bang theory that was not known about previously. It doesn't really change anything about the theory, but it does modify our understanding of the contents of the universe.The latest trio to win the Nobel Prize for Science were working on the study of exploding stars. The trio found in 1998 that the universe was expanding at a more rapid rate than anticipated, which would ultimately result in the universe becoming "more bleak".
Does this contradict, confirm or expand (pardon the pun) on the Big Bang Theory of Fr LeMaitre.
Blessings
Well, it's a detail of the big bang theory that was not known about previously. It doesn't really change anything about the theory, but it does modify our understanding of the contents of the universe.
Nobel prizes are usually not given to those who develop theories, but instead to those who perform important experiments. Einstein's Nobel, for example, was not given for relativity, but instead for his experimental work related to the photoelectric effect.Thank you for your very prompt answer.
If it was already a part of the BB Theory, they did not discover anything new.
Soooo.....Fr LeMaitre should have also been a co-winner posthumously?
Wiccan Child claimed that you could crush say a cup of water into ice if given enough pressure.
Well, you can't. There is resistance in the wires that go through your house, so any electricity that enters your house will be somewhat dissipated. So the only way to prevent electrical power from being consumed in your house is to prevent the electricity from traveling into your house in the first place by disconnecting everything (or, alternatively, by flipping the main circuit breaker).How could I make all of the electricity that goes to my house, change it's direction, and send it back to the electric company?
You cannot! Buy a grid tie in inverter and some method of producing electricity like PV panels, wind generators, hydro generators etc. Make sure the utility company gives you a rate that will make selling to them cost effective and will give you a payback period of 4-5 years!How could I make all of the electricity that goes to my house, change it's direction, and send it back to the electric company?
This works because anything which floats upon water displaces precisely as much water as its mass. Since ice is less dense than water, it floats, and some of it remains above the water. But because the ice displaces exactly as much water as its mass, when it melts you're just left with water at the same level.Here's another question about ice.
Practically everyone has seen this experiment. Fill a glass with ice, and then water to the rim. As the ice melts completely the level of water at the rim stays the same and does not overflow the glass.
Stay the same. Sea level rise will not occur because of the melting of sea ice. Rather, it occurs because of the melting of ice over land.Now consider this. Arctic sea ice is floating ice and it is loosing mass rapidly. As this ice melts, will sea level rise, lower, or stay the same. And to keep this exercise simple, assume that any melt from glaciers is not entering the oceans.
The melting could increase storm surges. The water is no longer trapped in the Arctic, it is now free to move around. So even if average levels remained the same the level could increase in some areas. From the wind, pull of the moon and so on.The melting of the Arctic won't increase sea levels.
How big is the contribution from that compared to thermal expansion?Stay the same. Sea level rise will not occur because of the melting of sea ice. Rather, it occurs because of the melting of ice over land.
And to think that these same seas are swarming with very temperature-sensitive creatures...However, there is a secondary problem with respect to sea ice melt: sea ice tends to be very white, while the sea is very dark. This means that when there is less sea ice cover during summer months, the arctic sea tends to absorb dramatically more sunlight. This is why the Arctic sea is the one place on Earth that has warmed the most in recent decades, with some areas being as much as 10C warmer (on occasion) than they were 40 years ago. The antarctic has also seen a significant rise in temperature for similar reasons.
I'm not entirely sure, unfortunately. My understanding was that on very long time scales (thousands of years), thermal expansion is actually the major driver of sea level rise. However, thermal expansion takes a while because the ocean takes a long time to warm up.How big is the contribution from that compared to thermal expansion?
Yes, that too. Somewhere around half of plankton is gone now. And that should scare the you know what out of anybody.And to think that these same seas are swarming with very temperature-sensitive creatures...
Also to add that sea levels rise due to the expansion of warmer oceans: [FONT=Arial, Helvetica, sans-serif][SIZE=-1]The thermal coefficient of expansion of water is 0.00021 per 1° Celsius at 20° Celsius.This works because anything which floats upon water displaces precisely as much water as its mass. Since ice is less dense than water, it floats, and some of it remains above the water. But because the ice displaces exactly as much water as its mass, when it melts you're just left with water at the same level.
Stay the same. Sea level rise will not occur because of the melting of sea ice. Rather, it occurs because of the melting of ice over land.
However, there is a secondary problem with respect to sea ice melt: sea ice tends to be very white, while the sea is very dark. This means that when there is less sea ice cover during summer months, the arctic sea tends to absorb dramatically more sunlight. This is why the Arctic sea is the one place on Earth that has warmed the most in recent decades, with some areas being as much as 10C warmer (on occasion) than they were 40 years ago. The antarctic has also seen a significant rise in temperature for similar reasons.
And this can have disastrous consequences for the ice locked on land in the adjoining areas, such as Greenland. The loss of ice in these areas has been accelerating in recent decades, with recent measurements showing much more ice loss than any models have predicted.
Interesting. Looks like overall it turns out to be a small effect, though.Well, the answers about melting sea ice came along the lines I thought they would, and I'm glad to see the pick up on thermal expansion. If I had thought about it I would have taken thermal expansion out of the equation as well.
Actually, there is a slight increase. Follow the link provided below for details. What I missed as everyone here did as well is that sea ice is virtually pure water. If it were melting in pure water the scenario would be as in the glass of water. But sea water contains salt and is therefore more dense. The fresh water will dilute the sea water making it less dense and therefore take up more space.
Sea level rise due to floating ice?
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