Page 211 - Primary Five Science

We say that chocolate has a higher melting point than ice.

Metals, like aluminium and iron, also melt when we heat them.

They have very high melting points. They have to be very hot

to melt.

Heat melts a solid and turns it into a liquid. Cooling freezes a

liquid into a solid.

Different solids melt at different temperatures, some high,

some low. These are called their melting points.

Temperature

Temperature is a measure of how hot or cold things are. You
need a thermometer to measure temperature.

Temperature is measured in degrees Celsius (°C).

 Ice melts at exactly 0°C.

 A hot bath is about 40°C
 Water boils at exactly 100°C

The water Cycle

Water on the earth is constantly moving. It is recycled over

and over again. This recycling process is called the water cycle.