> 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.

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