cart Shopping Cart cart(0)

Water Balloon and Candle



Water balloon and candle

You will need:

 
  • 1 Candle and matches
  • Balloon filled with water
  • An Adult present!

Instructions


1. Light the bottom of the candle, allow the wax to melt, than stick the candle on a surface.

2. Fill a balloon with water and tie it. Make sure that you keep the balloon fairly small to avoid stretching the rubber too much.

3. Light the candle and place the balloon over the flame so that the flame touches the balloon.

4. Count slowly to ten and then remove the balloon from the flame. It should not have popped!

5. Try the same experiment with an air-filled balloon... it should pop straight away.

6. Try holding the water-filled balloon over the flame for a long time... does it eventually pop?

Back to force & movement experiments

Back to heat experiments
Why does this work?

Heat from the candle will get transferred into the balloon rubber and whatever is filling the balloon... this is known as heat conduction. When you heat a gas or liquid it expands and rises up. Why is this so? The density of the gas or liquid decreases as it heats up.

The water within the balloon absorbs the heat from the candle and rises, drawing the heat away from the balloon rubber so that the balloon survives the flame. Once the hot water rises away from the flame to the top of the balloon it then cools down, dropping back towards the flame to then get hot and rise again. This process is continual convection current, whereby the warming water rises and the cooling water falls. This process helps to keep the balloon from popping by constantly drawing heat away. 

You see convection currents within lava lamps. In lava lamps the coloured oil is heated by a light and then rises, to eventually cool and fall back to where it started.... only to repeat the process again. Convection currents are incredibly important in our weather systems and ocean currents. 

The air-filled balloon pops because the air quickly expands and does does not absorb enough of the heat energy from the rubber to protect the balloon. This allows the rubber of the balloon to stretch very quickly, tearing the balloon.
 
Be Amazing Book Front Cover; Ben Newsome, teacher & founder of Fizzics Education. Be Amazing -how to teach science the way primary kids love
Be Amazing!
How to teach science, the way primary kids love

 
Read more about Be Amazing
 
Join our newsletter for more science teaching thoughts & ideas

Join the Fizzics newsletter

Back to force & movement experiments

Back to heat experiments
  • Learn about forces & motion!
  • Easy & safe to use

    science kits for sale
bell jar science experiment

Weather & Pressure school show

 
  • Learn more about convection & weather systems
  • Years 3 to 6
read morebook now

 

>100 Free Science Experiments on this site!

Coloured shadows
  • Experiments to colour your class!
  • Easy & fun
read more
 
skeleton and student
  • Make fake blood & more!
  • Biology made simple
read more
 
electricity experiments
  • Circuit science for kids
  • Cheap materials found easily
read more
 
Sugar and skittles dissolving in water experiment
  • Creative chemical concoctions!
  • Safe and engaging for kids
read more

School Science Visits: 

  • Highly engaging & curriculum-linked
  • Additional Teacher Support Resources
  • Professional visits in-class or via video conference
  • Both Primary School & High School science incursions
Call 1300 856 828 or use this form to discuss or make a show booking for your school!

Email updates

Signup to our monthly email Learn more
 

Contact us

1300 856 828
info@fizzicseducation.com.au

Unit 10/55 Fourth Ave
Blacktown, NSW 2148, Australia
 
facebook-icongoogle-icontwitter-icon
linkedin-icon youtube-icon   pinterest-icon