#### All numbers are not equal

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

More details | Watch now#### C60+ in space – a 28-year detective story about the Diffuse Interstellar Bands – Part 3

John Maier's team at the University of Basel solved the riddle of C60+ in 2015. In this brief view Colin Byfleet looks at the unique apparatus used in John's work.

More details | Watch now#### C60+ in space – a 28-year detective story about the Diffuse Interstellar Bands – Part 4

The early (mid 1990s) work on the electronic spectroscopy was carried out by John Maier's group, trapping C60+ in a neon matrix in this apparatus.

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.

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 main problems associated with communicating with distant space probes like Voyager 1 are investigated. The role played by diffraction in limiting the amount of power receivable on Earth is discussed. The further problems of reaching a nearby st....

More details | Watch now#### Constructing Chemical Formulas

An introduction to constructing and recognising chemical formulas. Using 20 well-known elements, the valency-rules which govern the atomic ratios are explained and used with several examples.

More details | Watch now#### Estimation – Educated Guesswork?

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.

More details | Watch now#### Fractions 1

How can we represent fractions in the simplest way? Equivalence of decimal and common fractions.

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

More details | Watch now#### Going round in circles – how do we do it?

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#### Isaac Newton and Gravitation

A look at what was known when Newton started to develop his theory of gravitation and how he used these ideas and data to make his great forward step

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#### 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.

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

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

More details | Watch now#### Oxidation Numbers and Equations

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.

More details | Watch now#### Spectroscopy

A survey of the variety and usefulness of the wide-ranging techniques which incorporate the name spectroscopy.

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