DK - WOW! The Visual Encyclopedia of Everything

(^399) LIQUID A liquid does not have a fixed shape, but does have a fixed volume. Its atoms can move past each other, allowing t ...

100 WATER Unlike most compounds, water can exist in all three states of matter, solid, liquid, and gas, within Earth’s normal r ...

101 WATER first incarnation is an art installation by British artist Sean Rogg. He collected water bottles from all over the wor ...

102 Almost everything around us is made from some sort of material. Each has different properties, such as strength or flexibili ...

103 (^10) RUBBER Natural rubber is an elastic material made from latex, a milky fluid from the rubber tree. Synthetic rubber is ...

The force of gravity is a force of attraction that exists between all objects with mass, from microscopic atoms to stars and pla ...

105 Gravity In orbit around Earth, astronauts become weightless and float about their spacecraft as if gravity did not exist. In ...

106 Every object tends to resist any change in its speed or direction. This property is called inertia. An object’s motion is on ...

107 NEWTON’S SECOND LAW This states that when a force acts on an object, it makes the object change speed or direction. As the t ...

Magnetism is an invisible force that attracts (draws towards itself) or repels (pushes away) certain materials. Any object that ...

The red needle on this compass points to the magnetic north pole 109 5 LODESTONE Nearly 3,000 years ago, people discovered that ...

From running a home computer to lighting up the world’s cities at night, electricity powers almost everything that we use. Elect ...

111 1 North America The USA has less than 5 per cent of the world’s population, but uses more than 15 per cent of the world’s el ...

112 Energy spreads in waves of electromagnetic radiation, like the ripples on a pond. It travels through space at the speed of l ...

113 VISIBLE LIGHT The Sun emits most of its energy as visible light, which can be split into the colours of the rainbow. Earth’s ...

114 COLOUR Gifts of money are given in red packets at Chinese New Year, because red is the colour of luck Yellow New York taxis ...

115 A yellow object absorbs all the wavelengths except yellow, which it reflects back to our eyes. The band of visible colours t ...

Simple machines make it easier for people to perform tasks, such as lifting or pulling, which would be difficult to do with musc ...

117 (^4) PULLEY A pulley is a rope looped around a wheel to make a load easier to lift or move. The more ropes and wheels are us ...

Technology is the practical use of scientific knowledge to invent tools and make tasks easier. With simple, early technologies, ...