Power of Pressure - How Things Work Author:Andrew Dunn Each title in this series takes one simple scientific principle as a basis for explaining the workings of a selection of everyday gadgets and machines. The illustrations aim to de-mystify the scientific theory and expose the workings of each machine. Focusing on the use gas and liquid pressure, this book explains the principles and their applica... more »tion in pumps, sprays, siphons and many other kinds of pneumatic and hydraulic machines, from a hovercraft to a simple drinking straw, aerosols to aeroplane wings, and tyres to lavatory cisterns.« less