Processing, please wait...
It was processed successfully!
It was processed successfully!
Login Create Free Account
Create Free Account
Oops! It looks like your security settings are blocking this video 🙁

If you are on a school computer or network, ask your tech person to whitelist these URLs:
*.wistia.com, fast.wistia.com, fast.wistia.net, embedwistia-a.akamaihd.net

Sometimes a simple refresh solves this issue. If you need further help, contact us.


Plant & Animal Cells Activity for Kids

Cell Diffusion Model DIY

  • Duration: 30-45 min
  • Difficulty: Medium
  • Cost: $0 to $15

Make color-changing gelatin blocks to model diffusion!

Material List

  • 1/4Red Cabbage
  • 4Cups of water
  • 4Packets of gelatin
  • 1Teaspoon of ammonia
  • 1Cup of vinegar
  • 1Blender
  • 1Strainer
  • 1Pot
  • 1Plastic knife
  • 1Ruler
  • 2Tupperware containers


  • 1Blend ¼ of a red cabbage in 4 cups of water for 1 min.
  • 2Strain the mixture into a pot and heat until almost boiling.
  • Warning:Use caution and an adult’s help when heating.
  • 3Stir 4 packets of gelatin (~28 grams) into the heated mixture.
  • 4Transfer the mixture into a plastic container and stir in 1 teaspoon of ammonia.
  • Warning:Ammonia has a strong odor. Once mixed in, the odor goes away.
  • 5Place the mixture in the fridge overnight.
  • 6Cut out 3 gelatin cubes: 2cm, 1cm, and 0.5 cm cubed
  • 7Add the cubes into a bowl of vinegar and observe.

How It Works

The vinegar molecules move into the gelatin cubes through a process called "diffusion." This causes the color to change due to the red cabbage juice. Diffusion is when molecules randomly vibrate from areas of high concentration to areas of low concentration. Diffusion in and out of the gelatin cubes happens more quickly in the smaller ones. This is why it is an advantage for cells to be tiny: molecules can diffuse in or out much faster.

Find More
Exciting Activities

More Activities

Browse All
Full Lessons

Watch Full Lessons
We’ve sent you an email with instructions how to reset your password.
Choose Your Free Trial Period
3 Days

3 days to access to all of our teaching resources for free.

Continue to Lessons
30 Days

Get 30 days free by inviting other teachers to try it too.

Share with Teachers
Get 30 Days Free
By inviting 4 other teachers to try it too.
4 required

*only school emails accepted.

Skip, I will use a 3 day free trial

Thank You!

Enjoy your free 30 days trial