Ratio and proportion

Is there a temperature at which Celsius and Fahrenheit readings are the same?

The large rectangle is divided into a series of smaller quadrilaterals and triangles. Can you untangle what fractional part is represented by each of the ten numbered shapes?

Scientists often require solutions which are diluted to a particular concentration. In this problem, you can explore the mathematics of simple dilutions

Does Joseph have too many sheep in his flock...

A brief introduction to PCR and restriction mapping, with relevant calculations...

Ever wondered what it would be like to vaporise a diamond? Find out inside...

Do each of these scenarios allow you fully to deduce the required facts about the reactants?

When a mixture of gases burn, will the volume change?

What does the empirical formula of this mixture of iron oxides tell you about its consituents?