ELI5 Why are the gas chamber of lighters divided into 2 narrowly connected chambers?

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Structural integrity. It’s a cross rib to ensure that the pressure combined with the high temperature doesn’t cause it to break. It’s not really two chambers, it just looks like it is.

sifsand

In plastic lighters, it’s not so much that it’s getting divided but rather that it’s getting structurally supported. The divider is a web of crisscrossed struts that reinforce the integrity of the lighter, whose contents are under a lot of pressure. You would never want, say, a lighter to explode if you left it outside in the hot sun. This is what prevents it from doing that.

jxf

I always thought it was used to help raise the height of the liquid when it starts to get low, so that the little straw thing is submerged for longer.

sonicjr