Bring one of Lower Key Stage 2’s most fascinating science topics to life with this exciting, interactive and curriculum-linked class assembly.

When the labels on the school science trolley mysteriously disappear, a group of Year 3 and Year 4 pupils is challenged to sort everything back into the correct place. As they investigate objects from the classroom, kitchen and playground, they meet a colourful cast of science characters—including Rocky the Solid, Droplet the Liquid, Steam the Gas and Dr Spark—who help them discover the three states of matter. Along the way, they learn how solids, liquids and gases behave, how heating and cooling cause materials to change state, and why science helps us understand the world around us.

Designed specifically for Lower Key Stage 2, this ready-to-perform assembly combines engaging storytelling with meaningful scientific learning, helping pupils build confidence with scientific vocabulary while exploring one of the key topics in the KS2 Science curriculum.

What’s Included
Complete three-act assembly script
35 roles (25 speaking roles and 10 non-speaking roles)
Character descriptions
Costume suggestions
Performance notes
Stage directions
Props list
Staging and technical guidance
Rehearsal guide
Director’s notes
Audience participation opportunities
Final whole-class science recap

Key Learning Covered
Pupils will explore:
The three states of matter: solids, liquids and gases
The properties of each state
How particles behave in solids, liquids and gases
Melting, freezing and boiling
How heating and cooling change the state of matter
Everyday examples of solids, liquids and gases
Scientific observation, classification and enquiry
Using scientific vocabulary confidently
How science explains everyday changes all around us

Perfect For
Lower Key Stage 2 (Years 3–4)
States of Matter topics
Science topics
Science Week
STEM events
Class assemblies
Parent performances
Whole-school curriculum events
Topic launches or end-of-unit celebrations

With 35 roles (25 speaking roles and 10 non-speaking roles), this assembly gives every child the opportunity to take part while building confidence, teamwork and performance skills. Featuring simple staging, minimal props, engaging audience participation and strong links to the Lower KS2 Science National Curriculum, it’s a fun and memorable way to help pupils understand the properties of solids, liquids and gases while developing scientific curiosity, observation skills and a deeper appreciation of the world around them.