On 16-11-2014 15:13, Stephen wrote:
> The heat is taken from the air and the hand that is holding it. You can
> feel the lighter getting cold and you can hear the butane rushing into
> the lighter. The sound will stop when the pressure has equalised and the
> lighter will continue to fill up.
>

Such a long time since I stopped smoking that I only dimly remember 
these things. The cold comes from the gas expanding, right? Same way as 
a fridge. Your last sentence seems contradictory to me. With equal 
pressure no further fill up, or am I wrong (probability: 98%)?

Thomas

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