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A presenter based at the British Antarctic Survey, Liz, explains that room temperature is typically 20°C whereas their cold room, where ice core samples are stored, is maintained at -26°C. The freezing points of water (0°C), shampoo (-3°C), olive oil (-12°C) and sunflower oil (-17°C) are then measured by Liz. Frozen food is usually kept at -18°C and Liz explains that a frozen chicken must be defrosted to room temperature before being cooked. This represents a rise in temperature of 38°C (-18°C to 20°C).
The Maths Channel
This clip is from:
The Maths Channel, Negative Numbers
First broadcast:
14 September 2007

Classroom Ideas

This clip can be used in a lesson where pupils are aiming to gain an understanding of the units used in recording temperatures. Pupils can be given a blank scale on which they have to plot the various temperatures expressed in the clip as they see them. This can then lead onto an activity where pupils are firstly given thermometers and asked to measure and record the temperature outside. They can then be given a map of the world, possibly with drawn features (such as ice or sunshine) for differentiation and asked to estimate the average temperature in various places across the globe, recording it on the map as they do so.

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