29 July 2016
Category:

127balloonM&M700x431RGB

What you need:

Two similar balloons

Two sports drinks bottles

Tape

Something to cut the ends off the bottles

Instructions

Cut the lock and screw ends off both bottles, keep the ends unlocked and stretch a balloon over each one.

Blow up one balloon a little and lock the cap. Blow up the other a lot more and lock.

Tape the caps together and unlock – air flows from the small balloon to the larger one and inflates it even more!

Results & explanation

The small balloon’s surface is very curved, so most of the tension in the rubber squeezes down on the air, increasing its pressure. The big balloon has a flatter surface, so the tension in the rubber mostly pulls on other rubber.

PS – Marvin & Milo are © IOP and can be freely used in schools.  Please do get in touch if you’d like to modify or use them for commercial purposes.

0 Comments

Leave a Reply

Log in with your credentials

Forgot your details?