# Water hardness

The formation of lather on the addition of soap with water is an easy and practical method for a comparative review on water hardness.

The formation of lather on the addition of soap with water is an easy and practical method for a comparative review on water hardness.

Pennies lose their shine after a while. This experiment explains what causes the dull colour on coins and how to make your pennies bright again.

The four colour theorem is a mathematical result from Graph Theory which says that **any** map can be coloured with four colours or less...

Store in a balloon the light (Hydrogen) gas produced from a chemical reaction. This gas will combust in the presence of oxygen, causing a small explosion to occur.

Brown’s Criterion is an application of a result in Mathematics which takes advantage of the fact that numbers can be uniquely written in base 2.

A simple activity illustrating the breaking down of colours by bleach by turning coloured solutions into colourless ones.

Demonstrating gyroscopic precession using a spinning wheel.

Discover where the Fibonacci sequence and the golden ratio, important mathematical concepts, are found in nature through this hands-on investigation.