Author Topic: Question...  (Read 4703 times)

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Offline croat1gamer

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Re: Question...
« Reply #20 on: August 22, 2009, 03:22:42 pm »
Guys, you never heard of flipping the bowl around so the water spills out?
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Offline Swastika von Judenbutt

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Re: Question...
« Reply #21 on: August 22, 2009, 10:53:32 pm »
Drink dat water.

Offline shantec

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Re: Question...
« Reply #22 on: August 23, 2009, 09:17:09 am »
Take the cup out and use it to drink the water..
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Offline STM1993

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Re: Question...
« Reply #23 on: August 23, 2009, 10:02:32 am »
I've seen this question a few times, but it also says that you aren't supposed to drink the water or touch the bowl directly, and it uses a plate instead of a bowl. If I don't recall wrongly, this should work:

Basically, you'd need a glass and a candle. Put the candle on the plate, light it, and then cover the candle with the glass. After a while, somehow the water gets sucked into the glass, leaving the penny there, which you can just take without having to wet your own hands.

Now where's that book of "magic tricks" I have in my house...?

EDIT:
I found it. Vicki Cobb's "Magic... Naturally!" It's an old book.

According to that book, the explanation says:
Quote
Scientists aren't completely sure of the whole story. Several things are going on at once here. When a candle burns, it uses oxygen, which makes up about 20% of the gases in the air (most of the rest of the air is another gas called nitrogen). The flame goes out when all the oxygen has been used. The air pressure inside the glass is now a partial vacuum and is less than the air pressure outside. So the outside air pushes the water up into the glass. At the same time, the flame produces carbon dioxide and heats the air in the glass. Both of these increase the air pressure in the glass, so the rising water takes up less than the 20% of space you might expect when the oxygen is used up.
« Last Edit: August 23, 2009, 10:16:54 am by STM1993 »

Offline a-4-year-old

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Re: Question...
« Reply #24 on: August 23, 2009, 10:19:41 am »
its not that thats a wrong answer to the question, it obviously works, its that its the dumbest most roundabout way of solving the question.
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Offline 8th_account

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Re: Question...
« Reply #25 on: August 23, 2009, 10:34:54 am »
Where did the burning candle come from? If we're allowed new items like that you'd might as well use a vacuum cleaner to suck out all the water.

Offline UnknownSniper

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Re: Question...
« Reply #26 on: August 23, 2009, 10:54:55 am »
Or you could just use the candle to heat up the bowl or plate and it will break once hot enough if the water is warm or cold, not hot water obviously.
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Offline Kazuki

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Re: Question...
« Reply #27 on: August 23, 2009, 11:15:52 am »
Quote
Scientists aren't completely sure of the whole story. Several things are going on at once here. When a candle burns, it uses oxygen, which makes up about 20% of the gases in the air (most of the rest of the air is another gas called nitrogen). The flame goes out when all the oxygen has been used. The air pressure inside the glass is now a partial vacuum and is less than the air pressure outside. So the outside air pushes the water up into the glass. At the same time, the flame produces carbon dioxide and heats the air in the glass. Both of these increase the air pressure in the glass, so the rising water takes up less than the 20% of space you might expect when the oxygen is used up.

;O That last part is pretty cool. I know that liquids and foams expand drastically once they're in a vacuum, but I wasn't expecting less than 20%. Guess I should've deducted that, though.
« Last Edit: August 23, 2009, 11:37:48 am by Kazuki »

Offline a-4-year-old

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Re: Question...
« Reply #28 on: August 23, 2009, 11:35:11 am »
Or you could just use the candle to heat up the bowl or plate and it will break once hot enough if the water is warm or cold, not hot water obviously.
Boil the water off!

Also Kaz you've lost me, liquids don't change volume under pressure.
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Offline Swastika von Judenbutt

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Re: Question...
« Reply #29 on: August 23, 2009, 11:37:25 am »
No seriously you could just drink the water, fish bowls aren't that big.  Your hands aren't in your mouth so it wouldn't be breaking any rules.

Offline Kazuki

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Re: Question...
« Reply #30 on: August 23, 2009, 11:39:26 am »
Sorry, I meant they expand in a vacuum, not contract (in this case, though, the opposite would happen). As far as I learned in chemistry, some liquids tend to partially evaporate into gasses as they crossed the line on the temp-pressure graph. Maybe that was for an ideal gas. though.

Offline a-4-year-old

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Re: Question...
« Reply #31 on: August 23, 2009, 03:21:48 pm »
the pressures we are dealing with are probably less than even 1 PSI I highly doubt water would change state.
If we hit the bullseye the rest of the dominoes will fall like a house of cards. Checkmate. -Zapp Brannigan