Chemistry - Particle Theory: Diffusion

In this MEL Academy lesson your children will:

  • learn the science behind diffusion
  • perform chromatography analysis
  • obtain beautiful chemical reefs

Lesson time

8:00am   PST (San Francisco, Seattle, ...)
9:00am   MST (Phoenix, Denver, ...)
10:00am   CST (Chicago, Houston, ...)
11:00am   EST (New York, Toronto, ...)
4:00pm   GMT (London, ...)

Lesson duration: 45-55 minutes.

Prepare in advance

In this lesson, we will conduct several DIY experiments. Prepare in advance household materials shown below.

DIY Materials

  colourful (e.g. fruit) tea bags
  access to water (cold and hot)
  2 x transparent plastic cups
  glass bowl
  felt-tip pens or highlighters (not sharpies)
  5x sheet of paper towel or coffee filter paper
  3x tall glass
  4x white round chalk (optional)
  plate (optional)
  rubbing alcohol (optional)


Please, download and print this worksheet in advance. You’ll need to refer to it during the lesson.

MEL Experiment

If you are a subscriber of MEL Chemistry then you can conduct Chemical reefs experiment from the Diffusion chemistry set:



This lesson is presented by Daniel Sullivan:

Daniel Sullivan

Daniel Sullivan is a hugely enthusiastic and experienced ex-head of science with over 20 years of teaching experience. He is now running a science teacher training company and is looking forward to engaging with students once again.