Sign up for free

Autumn STEM Guide

Welcome to the Autumn 2021 edition of our seasonal STEM guides! It contains:

  • STEM related autumn events and themed days/weeks
  • Quick, easy website and activity suggestions for how to get involved (click on the pictures to find out more)
  • Autumnal STEM resource recommendations

Diaries at the ready! The events listed below are a really good way to help theme your STEM activities and help children to make real-world links. From mild weather to frosty starts, from darker evenings to colourful trees, Autumn has it all! Make the most of this time of transition with these STEM events.

National Coding Week (14-20th September)

National Coding Week aims to build people’s confidence and digital skills through fun, engaging coding events. You can take part by learning to code. There are lots of great coding activities and games online to help you with this. Visit their website to get involved:

How to get involved…

National Recycling Week (20-26th September)

National Recycling Week to bring a national focus to the environmental benefits of recycling. Each year Recycle Week attempts to change people’s recycling behaviours while gaining positive publicity. It’s a great chance to raise awareness of the importance of recycling to children.

How to get involved…

Biology Week (2-10th October 2021)

Biology Week showcases the important and amazing world of the biosciences, getting everyone from children to professional biologists involved in fun and interesting life science activities.

How to get involved…

World Space Week (4-10th October 2021)

World Space Week is an international celebration of science and technology, and their contribution to the betterment of the human condition. World Space Week consists of space education and outreach events held by space agencies, aerospace companies, schools, planetariums, museums, and astronomy clubs around the world. Visit their website to find out more:

How to get involved…

International Archaeology Day (16th October)

International Archaeology Day (IAD) is a celebration of archaeology and its contributions to society. Every October the AIA and archaeological organisations around the world present archaeological programs and activities for people of all ages and interests. 

How to get involved…

Chemistry Week (17-23rd October 2021)

National Chemistry Week (NCW) is a public awareness campaign that promotes the value of chemistry in everyday life. This years theme is ‘Sticking with Chemistry’. Visit their website for educational resources linked to this theme.

How to get involved…

Nuclear Science Week (18-22nd October 2021)

Nuclear Science Week is an international, broadly observed week-long celebration to focus local, regional and international interest on all aspects of nuclear science. Nuclear Science week explores what it means to “Think Clean. Think Solutions. Think Nuclear.” Click here to view lesson plans and resources on their website.

How to get involved…

Big Wild Walk (25-31st October 2021)

It’s time to walk for wildlife and show you care about the nature and climate crisis with The Wildlife Trusts’ Big Wild Walk, 25 October to 31 October. The Wildlife Trusts are asking nature-lovers to fundraise to help raise vital money for their 30 by 30 projects that will restore 30% of land and sea for nature by 2030. Get fit, have fun and raise money for wildlife! Invite the family to join in, set up a remote relay with friends or take the challenge yourself. Visit their website to find out more:

Bonfire Night (5th November)

Try a bonfire night-themed STEM activity such as ‘Frozen Fireworks’. This activity explores the question ‘what happens when we mix fluids of different densities’. For full instructions click here.

Autumn STEM Resource Recommendations

Here are a few of our ‘must have’ Autumn STEM resources. We think you’ll come back to them year after year with your children! Click on each picture to view it on Amazon.

Have we missed off an autumn STEM event or a ‘must have’ autumn STEM resource? If so then add it to the comments below. (note: this is a UK based website so some events have a UK focus).

Frozen Fireworks

Frozen Fireworks

What happens when we mix fluids of different densities? 

You will need

  • A clear glass or jar
  • Warm water
  • Vegetable oil
  • Food colouring
  • An ice cube tray
  • A pipette (optional)
  • Honey and milk (optional)

How to do it

Note: you will need to prepare the ice cubes in advance of the activity.

  1. Fill up an ice cube tray with water. Add a few drops of food colouring to each ice cube mould, either by squeezing them from the bottle or using a pipette. Then place the tray in the freezer for a few hours.
  2. Once the ice cubes are frozen, part-fill your jar with warm water, leaving space at the top.
  3. Then add a 2cm layer of vegetable oil. You will notice that the oil floats on top of the water.
  4. Place the ice cubes into the jar and watch them float in the oil layer.
  5. Watch as the ice melts and the coloured droplets sink down into the water and mix together, creating fireworks!

What are we learning

Density is the mass of an object divided by its volume. Put another way, it is the amount of ‘stuff’ that can fit in a given space. Some materials are very light for their size while others are very heavy. For example, a brick and a sponge might be a similar size but the sponge would be a lot lighter. This is because it is less dense. Oil is less dense than water so it floats to the top of the jar. The ice cubes are also less dense than the water, which is why they float in the oil layer. As the ice melts and turns into liquid, it becomes denser than the oil. This causes the food colouring droplets to sink into the water and diffuse (spread out), creating what looks like fireworks.


Now try adding other fluids to your jar, such as honey or milk. How do their densities compare to water and vegetable oil?

Careers associated with this activity