>>> Your freezer contains a gas, sure you can't observe it directly
>>
>> Or rather, you can - but please don't! :-S
> 
> Well quite :-) Thinking about it if you've got a computer 'air-duster' 
> cleaner then that contains a compressed-to-a-liquid gas, normally one of 
> the flurocarbons.

Oh, is *that* way it says not to use the can upside down, despite this 
being the most useful configuration? :-)

[Seriously. Why don't they just arrange the innards of the can the other 
way round?]

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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