Sound
This activity will help your child explore the science of sound
Equipment You Will Need:
- Washing up liquid
- straw
- coloured paints
- paper
- water
- Small plastic tubs
What you need to do
1. Use the three primary colours of paint, red, blue and yellow. In a small tub mix a small amount of paint with water and a squirt of washing up liquid repeat for all three colours.
2. Put a straw into the liquid and ask your child to blow. Ask them if they can hear the air bubbling through the liquid.
3. Bubbles should start to appear quickly, see if you can listen to the bubbles popping.
4. Place a sheet of paper over the bubbles and create a bubble print.
6. Try some other colours and layer up the bubble prints. Can you make more colours than the three you started with?
What is happening?
A bubble is just air wrapped in soap film. Soap film is made from soap and water (or other liquid). The outside and inside surfaces of a bubble consist of soap molecules. A thin layer of water lies between the two layers of soap molecules, sort of like a water sandwich with soap molecules for bread. They work together to hold air inside.
Why do bubbles pop?
Why do bubbles pop? Other than being poked or landing on something sharp, bubbles pop when the water between the soap film surfaces evaporates.
How do you hear bubbles popping?
The outer ear collects the vibrations that cause sound. The inner ear is filled with fluid and has the hearing organ called the cochlea. This organ helps to take the vibrations and translate them into electrical signals for the nerve to send to the brain. It actually uses little hairs that vibrate with the sound waves in the fluid. Then you "hear" it.
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