Is a lighter effective because it’s on fire? Or just because it’s hot?

If you made a lighter that was just as hot as another lighter, would it work just as well even if it had no fire?

  • @[email protected]
    link
    fedilink
    English
    4111 months ago

    Cars have (or had, I don’t know if they’re still included) an electric lighter that you pushed in to heat up. It was basically a little metal ring that got really hot. So I think it probably is the heat.

    I remember my friend also had a plasma lighter, that unsurprisingly used plasma to light things. It made a really scary noise in the wind and hurt like a motherfucker to touch. We were 18 and dumb.

    • DebatableRaccoon
      link
      fedilink
      1911 months ago

      It’s the heat and no, cars don’t come with lighters anymore. The power sockets are still there but they even come with warning labels to not try use a lighter in them. No idea what happens if you try.

      • @[email protected]
        link
        fedilink
        1911 months ago

        My car seems to be from the transition period, it has a lighter but no ash trays in the front, only in the back.

        I guess it’s fine for the kids to smoke while watching the in built DVD players but not the driver and front passenger /s

  • Deconceptualist
    link
    fedilink
    English
    32
    edit-2
    11 months ago

    Lots of people are mentioning old electric car lighters, but not why things burn. The answer is the fire triangle, which just means you need 3 factors: fuel, oxidizer, and heat. Oxygen is obviously the most common oxidizer (hence the name) and basically everywhere in the atmosphere. And any substance that undergoes a sufficiently exothermic reaction will produce enough heat to propagate that oxidation as a chain reaction (i.e. fire) once enough heat is present to start it.

    Not all fuels are equal. Ones that burn slowly will smoulder, while the ones that burn extremely fast explode. Too many unintended and destructive fires occur because people don’t realize when fuel sources are susceptible to heat (even a tiny spark), such as dust in a grain silo, a pile of oily rags, or even a compost heap (which builds up heat due to bacteria breaking down the contents).

    But yes, back to the point, lighters just need to create heat because presumably you already have fuel and oxygen available.

  • @21Cabbage
    link
    English
    1011 months ago

    My lighter uses an electric arc, great for cigarettes, doesn’t seem to like weed as much.

    • @[email protected]
      link
      fedilink
      211 months ago

      I’ve wondered about those for camping. I can see how the electric arc would be perfect where you have something like an edge of paper, but I did wonder if it would still be effective with other fuels.

      • @21Cabbage
        link
        English
        411 months ago

        So intrusive thoughts won while I was in the bathroom and I grabbed a square of toilet paper. Boy oh boy will it light paper on fire.

      • @21Cabbage
        link
        English
        211 months ago

        I haven’t tried setting paper on fire directly, to be honest. Being that it’s so hot but also a localized heat I suspect it might be hard to get flames from, just embers.

    • Bizzle
      link
      fedilink
      English
      111 months ago

      I figured it prob won’t like bowls but I assume joints are fine?

      • @21Cabbage
        link
        English
        311 months ago

        I think it’s the more uneven burn. It’s got an articulating neck type thing so it’ll get into a bowl just fine it just doesn’t want to light it, and joints it just kinda fucks up the end and maybe gets a half-assed light.

  • @[email protected]
    link
    fedilink
    711 months ago

    Depends on what you want to use the lighter for. People mentioned car lighters that work with just heat, but if you just want to light a gas stove, than a spark is enough. There are lighters that do just that, or you can even use an emptied regular lighter.

    • @[email protected]
      link
      fedilink
      211 months ago

      The flints you get for “primitive technology” camping are great for lighting gas flames - just scrape them to make a load of sparks

  • @[email protected]
    link
    fedilink
    611 months ago

    Essentially the 12 volt cigarette lighters in cars are fireless. There’s also plasma-like lighters that work with electricity.

    So yeah, do they work just as well? Depends. Fire lighters are a handful in windy conditions. Electric lighters are less efficient but they work just fine.

  • Ephera
    link
    fedilink
    611 months ago

    Burning is a chemical reaction which requires relatively much activation energy to start, but then produces enough energy to keep activating (i.e. sustaining) itself.

    You just need to deliver enough activation energy to a given point on the material, which you can do with a flame, but also for example an electric spark, a glowing metal or a magnifying glass under sunlight.

    You can also put the entire flammable material into an electric oven and slowly turn up the heat, until you reach this temperature: https://en.wikipedia.org/wiki/Autoignition_temperature

  • @[email protected]
    link
    fedilink
    411 months ago

    Something quite interesting in relation to that is that it takes a lot more energy to start a wood fire if you would use a heating coil instead of an open flame. Why? There are only about 4 papers about that and they are all old and the methodology weren’t up to modern standards so take that with a grain of salt

    • Lvxferre
      link
      fedilink
      411 months ago

      I’m kind of guessing it, but perhaps it’s because of heat conduction. Fire pretty much directs the heat to one direction (the top), while the coil probably spreads it evenly.

  • @[email protected]
    link
    fedilink
    311 months ago

    Fire is just the result of a self sustaining exothermic reaction - there’s no inherent “fireness” that makes heat from a fire different from all other heat sources.

  • @[email protected]
    link
    fedilink
    311 months ago

    There are two kinds of electric handheld lighters, the plasma arc kind and the resistance kind. The resistance kind isn’t as popular but they still exist. They are similar to car lighters, electric stove coils, etc. I don’t know whether a plasma arc would be considered fire, but the heated wire is probably not.

  • @[email protected]
    link
    fedilink
    211 months ago

    There are electrical lighters, which work by providing an arc of electricity. And back in the days, I used to light cigarettes on my electrical stove when the lighter was empty.

  • @[email protected]
    link
    fedilink
    211 months ago

    If you google “electric lighter” you can see a wide variety of lighters that work by either making an arc of electricity or just getting really hot.

  • @[email protected]
    link
    fedilink
    English
    211 months ago

    I have an electric lighter that we use for lighting candles. It charges via USB and generates a short spark between two contacts to light the candle.