News Release

A sweeter way of teaching health and safety

Peer-Reviewed Publication

University of Sheffield

Measuring the Toughness of the Material Chocolate (1 of 2)

image: Measuring the toughness of the material chocolate. view more 

Credit: The University of Sheffield

A new study shows using chocolate as a test material in experimental, hands-on practical work increases student engagement. It provides a much better way than previous methods for helping students understand the importance of health and safety in their ongoing studies and future careers.

Health and Safety is traditionally a difficult and dry subject to get across to students, especially early in their university program. First year students struggle to see the relevance of key hazard control techniques such as risk assessment and are more enthusiastic to proceed with the practical aspects of the work.

The adoption of chocolate is part of the practical 'Danger Lab', designed to introduce students of all levels of skill and experience to the practice of designing their own experiment, assessing the dangers and hazards associated with it, and to reinforce the basic concept of a safety culture - that of individual responsibility. The experiment sees students measure the toughness of chocolate, how hard it is to break, at room temperature and then how it changes by dipping it in liquid nitrogen, -196 degrees Celsius.

Dr Julian Dean, Senior Lecturer and co-creator of Danger Lab said "Trialling the concept in the Department, we saw a significant increase in student engagement, with the basic principles reinforced when they entered the laboratories for their core practical sessions."

"The use of chocolate as the test material in the risk assessment is an attractive lure to performing the experiment, but the use of liquid nitrogen puts the student on the back foot making them cautious. Students perceive real risk in an environment that appears fraught with danger, but which is actually carefully controlled."

First year undergraduate student Jason Burnap said "Explanations as to how a risk assessment is conducted and the importance of carrying out such protocols were made clear and concise by the teachers. The laboratory activity (Charpy testing) was also fun to do, and I learnt a lot about the property "fracture toughness" from performing the experiment."

Professor Stephen Beck, Head of Multidisciplinary Engineering Education in The Diamond, said "From a technical management perspective these introductory Danger Labs fulfil a critical role, laying the seeds for future benefits when this first year cohort progresses to carry out more student led activities, project work and research programs. The Diamond aims to create a new generation of Sheffield graduates who are health and safety capable, responsible, risk aware, but not risk averse."


Notes to Editor

A sweeter way of teaching health and safety, Physics Education

The Experiment

The experimental practical was first developed in the Department of Materials Science and Engineering, as part of first year undergraduate practicals in which students design, cost and cast composite chocolate samples to maximize a particular performance criterion. This has now been rolled out to the entire Faculty of Engineering (>1600 students).

Using the material chocolate to test the fracture behaviour of a material was first designed by Dr Russell Goodall and published in Physics Education in 2011, and has since become used in a number of other practical such as "high performance composite chocolate" also published in Physics Education 2013.

Engineering at Sheffield

The Faculty of Engineering at the University of Sheffield is one of the biggest in the UK. With seven departments and three interdisciplinary programmes covering all the engineering disciplines, over 5,000 students, 950 staff and £77m annual research-related income from government, industry and charity, it is one of the best institutions in the world to study or carry out research in engineering.

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