Bunsen Burner Safety

When using a Bunsen burner:

  • Do not leave the gas running for a long time without igniting it, as the gas is methane and inhaling high concentrations of it is a bad idea.
  • Remember to clear all surrounding objects, especially flammable ones.
    • This also includes hair and clothing, so tie up long hair and don’t wear loose clothing.
  • In case of a fire, use the fire extinguisher — don’t use water to put fires out.
    • If your clothing catches fire, get people to help with the fire blanket, wrap yourself in it, and roll around on the ground until the fire is put out.
  • Accidents that happen should be reported to the teacher as soon as possible.
Lighting the Burner: Step 1
  • First, open the gas valve slightly to release some fuel into the burner.
    • It’s not advised to keep the valve open for too long at a time without a flame, as an excessive build-up of flammable gases is not conducive to human life.
  • Once you have some gas flowing into the burner, you can strike the flint over the flame.
  • If three strike attempts have passed without a flame, let the gas dissipate before trying again.
Lighting the Burner: Step 2
  • Begin by pressing the flint portion hard against the steel plate.
  • Then, squeeze the handle of the flint so that it rubs against the steel plate and generates sparks.
  • It’s recommended that you have the sparks facing away from you during this process, by facing the small cup away from you.
Lighting the Burner: Step 3

There are two ways one can adjust the size of the flame on a Bunsen burner:

  • changing the flow of gas
  • changing how open the oxygen valve is

The Bunsen burner’s flame is a combustion reaction between oxygen and methane, kick-started with the heat of a flint striker. Increasing the amount of methane and oxygen increases the size of the flame, done by rotating the gas valve in the right direction or opening the oxygen valve, respectively.

This is because more reactant is introduced into the reaction, increasing the rate of reaction. Decreasing either reactant slows the reaction, and makes the flame smaller.