And lo On Tue, 18 May 2010 12:34:53 +0100, Warp <war### [at] tagpovrayorg> did  
spake thusly:

> Phil Cook v2 <phi### [at] nospamrocainfreeservecouk> wrote:
>> Just to act on the dumb side. If you use a graduated beaker with a  
>> candle
>> in it, add the water, and the second beaker, and then measure the water
>> height. Shouldn't the increase in temperature in the up-turned beaker
>> create a high-pressure that forces the water out from under it and thus  
>> an
>> increase in the water height as measured in the graduated beaker? So why
>> is the level of water forced out by the high-pressure less than the  
>> amount
>> 'sucked' in by the low-pressure?
>
>   I didn't understand the question.

The water is 'sucked' in because the cooling air inside the beaker lowers  
the pressure, but prior to that the air was hot and therefore should be at  
a higher pressure and force the water out of the beaker. Why does water  
out not equal water in?

As an additional thought set up the experiment three times identically  
except in Exp1 use a room-temperature beaker, in Exp2 a beaker straight  
 from a warming-oven, in Exp3 a beaker from a refrigerator. Would you  
expect to see any difference in the water level when the flame goes out?

-- 
Phil Cook

--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com

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