Lighters!

“LIGHTERS":

Question
How is it made?
How does it works?

Hypothesis
The lighter contains a liquid gas and this produce the flame

ReasearchClipper 
Is the brand name of a type of refillable butane.
Butane lighers have a valved orifice that meters the butane gas as it escapes. 
A spark is created bystriking metal against a flint Butane lighters combine the striking action with the opening of the valve to release gas. The spark ignites the flammable gascausing a flame to come out of the lighter.
Zippo
The wick of the Zippo is made of non-flammable fibre and is wrapped in braided copper wire.
This cottonwool is impregnated with lighter fluid. 
When the Zipo is struck, the wheel grinds sparks off the flint which ignites fuel that has soaked up the wick. 
Heatfrom the flame travels down the copper braiding into the impregnated wool heating up the fuel.
Magiclick
Contains a piezoelectric device throughwhich a high voltageis generated,producing an electric arc which ignites a gas flame. Some incorporate a load of butane gas.

Experiment:
Materials:
* A littlebottle with the top (make a hole in the top).
* Gas
* A lighter or another thing that produce fire fo example: a match.
Procedure:
1) First putthe gas inside the bottle and close it with the top.
2) Place the lighter above the bottle´s top hole, light it on, and watch the results.

ConclusionWhen we finished our experiment we watched a video in which we notice that the lighter also needs friction, not only gas, so our hypothesis is incorrect