A Bunsen burner is mainly used in science labs to heat substances, carry out combustion reactions, and sterilize equipment such as metal tools or inoculating loops. It provides a controlled, adjustable flame (usually fueled by gas) that can be made cooler and yellow or hotter and blue by changing the air supply.

What is a Bunsen burner?

A Bunsen burner is a simple gas burner used as standard laboratory equipment in schools, colleges, and research labs. It mixes a flammable gas (like natural gas) with air before ignition to produce a hot, non-luminous flame suitable for many experiments.

Main uses (quick list)

  • Heating liquids in test tubes, beakers, or flasks during experiments.
  • Melting solids or boiling liquids to study changes of state or speed up reactions.
  • Sterilizing small lab tools and the mouths of test tubes, especially in microbiology.
  • Performing combustion experiments, like testing flammability or studying reaction products.
  • Doing flame tests to identify metal ions by the color they give in the flame.
  • Drying or dehydrating chemicals, such as removing water of crystallization from salts.

How the flame is adjusted

  • With the air holes mostly closed, the burner gives a yellow “safety” flame that is cooler and easier to see but not good for strong heating.
  • With the air holes open, it produces a blue flame that is much hotter and ideal for heating and many chemical reactions.

Example you might see in class

In a typical school chemistry class, you might use a Bunsen burner to gently heat a copper sulfate solution in a beaker until crystals form as the water evaporates. In a biology lab, the same burner might be used to sterilize an inoculating loop before transferring bacteria to an agar plate.

Information gathered from public forums or data available on the internet and portrayed here.