Science Challenge

Science Challenge

Get involved in our July Science Challenge - How do lungs work?


  • A plastic bottle
  • A straw
  • An elastic band
  • Scissors
  • 2 balloons
  • A small piece of playdough (or something to cover the top of the bottle with)


  1. Carefully cut your bottle in half with the scissors (you might want help from a grown-up to do this).
  2. Tie a knot at the bottom of the balloon and cut off the top.
  3. Stretch the balloon around the bottom of the plastic bottle.
  4. Put a straw in the neck of the other balloon and secure it tightly with the elastic band (do not squash the straw when you do this). The air must flow through, so test it with a little blow through the straw to see if the balloon inflates.
  5. Put the straw and balloon into the neck of the bottle. Use the playdough to make a seal around the bottle, trying not to squash the straw.

Hold the bottle and pull the knot at the bottom. What happens?

The Science:

This fake lung demonstrates how our lungs work. Air is taken in through the mouth and nose, passes down the windpipe and into our lungs. The diaphragm at the bottom of the chest moves down to create more space. As we breathe out the diaphragm raises again. The knotted balloon represents the diaphragm and the balloon inside the bottle represents the lungs.

Please send in photos of your work via Google classroom or the office email address This email address is being protected from spambots. You need JavaScript enabled to view it..

Science of the Month

Choose one of the following topics to investigate:

  1. Write a paragraph or draw a picture of a famous doctor or nurse of your choice.
  2. Can you make a list of 10 different jobs in medicine. Here are two to get you started… doctor, nurse.
  3. Can you make a poster showing some wonderful medical discoveries that have improved our lives.


You can also download our Science Challenge as a PDF.