On 16/11/2014 12:56, Le_Forgeron wrote:
> On 16/11/2014 13:48, Stephen wrote:
>
>> You are both saying pressure and yes I am talking about butane lighters.
>> Consider this, the pressure differential between the gas cylinder and
>> the lighter is equalised within a fraction of a second.
>
> How ? the lighter has a depleted pressure chamber, and only liquid is
> flowing from the refiller.
>

But it is only liquid because it is under pressure. As soon as some 
liquid is in the lighter it vaporises to fill the chamber and if the 
resultant pressure is less than the pressure in the gas cylinder more 
liquid will go into the lighter until the system will reach stability.

> Yes, adding liquid to the lighter gives back a bit of pressure for the
> lighter's side, but not enough. The fresh liquid could vaporize to
> provide more gas but that transformation requires a lot of heat which is
> not available at the refill time.
>
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.

>> Yet still the
>> liquid flows after that.
>>
>>
>
>


-- 

Regards
     Stephen

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