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Welcome to the new CLEAPSS Science Website
What is CLEAPSS
CLEAPSS resources give teachers ideas for exciting and engaging practical activities that fire pupils' imaginations and then, unlike many other sources of ideas, go on to show teachers and technicians in detail how to translate the ideas into safe and exciting experiences in the classroom.
CLEAPSS advice and documentation is recognised by the Health and Safety Executive and the Department for Education.. (read more)
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Latest news from CLEAPSS..
CLEAPSS ECT Training
Got an NQT/ECT joining your school next term ?

Then sign them up for one of our ECT Course H&S in practical Science for early career teachers

Discover the Fascinating World of Slime Moulds with CLEAPSS
Unlock the mysteries of slime moulds with two brand new guides from CLEAPSS: GL471 Slime Mould and GL472 Activities using Slime Mould.

These comprehensive resources outline what you need to bring the study of slime moulds into the classroom. 

Useful for studying behaviour and growth, GL471 offers expert insight into slime mould biology, care, and observation tips, whilst GL472 features engaging, hands-on activities designed to inspire curiosity and scientific investigation.
CLEAPSS WhatsApp Channel
We now have a WhatsApp Channel to keep you up to date with all things CLEAPSS.

Use this QR code to subscribe to the CLEAPSS Channel.
CLEAPSS at the ASE Conference 2025
Find all the resources related to our workshops, talks at the ASE Conference in Nottingham 2025.

CLEAPSS - Teachers H&S Self Study Online Course
We have developed a new self-study course for teachers, which covers the basics of health & safety and how to manage practical work and risk assessments in lessons.

We expect this to take 2-3hrs to complete.

This is a FREE course, all you need to do is complete this registration form.

The course is made up of a series of videos and some tasks. There is an option to download / print off the PowerPoint slides used in the videos to enable users to made notes during the course.


What's new.. All new documents..
GL476 - Plug top power supplies
This guide describes common issues with plug top power supplies used with laboratory equipment, and how to source suitable alternatives. 
 (14 Jul 2025)
PP153 - Investigating osmosis of red blood cells
This procedure outlines how to observe lysis and crenation of red blood cells using different concentrations of saline solutions. 
 (7 Jul 2025)
The Penny Hofmann
A simple and cheap Hofmann apparatus made from items found about the lab. 
 (3 Jul 2025)
PP180 - Transition activity: Measuring volume, mass and force
A series of simple yet engaging activities to support visiting children to become familiar with commonly used measuring equipment.
 (24 Jun 2025)
GL472 – Activities using slime mould
This guide outlines a number of practical activities and investigations using the slime mould Physarum polycephalum, including making mazes, investigating food choices and observing features under a m.. full details
 (23 Jun 2025)