On 17/11/2014 12:25, scott 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.
>
> One possibility is that the sound you hear is actually a small amount of
> gas flowing rapidly into the lighter (or liquid that instantly
> evaporates as it hits the low pressure in the empty lighter) before the
> liquid starts to flow through the opening. When the sound stops that
> isn't because the pressure has equalised, just that it is liquid flowing
> much slower then rather than gas flowing quickly.
>

You could very well be right. I did not think of that.
Someone needs to do a doctoral theses on the subject. :-)

-- 

Regards
     Stephen

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