And lo On Wed, 19 May 2010 12:52:17 +0100, Warp <war### [at] tagpovrayorg> did  
spake thusly:

> Phil Cook v2 <phi### [at] nospamrocainfreeservecouk> wrote:
>> 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?
>
>   The glass is put on the plate *after* the candle has been lit, so the  
> air
> around the candle is already hot.

But the air around the "air around the candle" isn't as hot as it  
transmits the heat along so you get a temperature gradient around the  
candle prior to the beaker. Put the beaker over it and the air at the edge  
cannot transmit the heat as quickly so it gets hotter.

>   An interesting experiment would be to put the glass first and *then*  
> light
> the candle to see what happens. (Of course you have to devise a way to do
> that. A magnifying glass and sunrays might be enough.)

Now that is something to try.

-- 
Phil Cook

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

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