#### The making of graphene

Description of chemical vapour deposition to make large area graphene samples

More details | Watch now#### Centripetal force – how do we measure it?

A short video showing a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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A presentation showing both the ideas about centripetal force and a simple classroom method of checking the way in which this force is related to mass, speed and radius.

More details | Watch now#### Measuring the speed of pulses

A short clip showing the experimental measurement of the speed of electrical pulses in a cable - a large fraction of the speed of light.

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A presentation showing how to measure the speed of sound over a short distance on a laboratory table.

More details | Watch now#### Chemical Equations – and how we construct them

An introduction into the writing down of fully balanced chemical equations. The process is explained starting with word equations, finding all the relevant formulas and then working with some useful rules for finding the correct coefficients in the b....

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The concept of oxidation and reduction is explained and generalised using oxidation numbers with ionic and covalent examples. Several equations are balanced, using the oxidation number method to fix various atomic ratios.

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This is a fully interactive program allowing many useful ways of investigating conic sections both visually and algebraically. It comes with a full set of explanatory notes for both teacher and pupil.

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How can we make sensible estimates of very large numbers? It is often very important to know the size of an unknown number, at least to within a factor of ten.

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An introduction to the various types of numbers which are recognised as important.

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An approach to adding and subtracting fractions, using an understanding of the processes involved.

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