The right material for the job.

Aluminum is used for making saucepans, and it's not difficult to see Why. Aluminum:

• is a good conductor (and so let’s heat flow easily from the cooker to The food)
• has a high melting point (and so does not melt on the cooker)
• Is not much affected by chemicals or corrosion'

Aluminum is the’ right material for the job''

Here are five jobs, and five materials [o do them' Match up each material With the job it does, (It will help to decide first of all whether an Insulator or a conductor is needed.) Then explain how you made your Choice.

The Jobs

A. Lining a picnic box. The lining must prevent heat from outside the box from getting to the cold food inside.

 

B. Making a glass blower's blow pipe. The material must be a metal, but it must allow the glass blower to blow glass at over 1000'C without burning his lips.

C. Insulating an underwater oil pipeline. The oil is hot when it comes out of the ground. If it cools too much, it won't flow.

D. Making a car radiator. The radiator has to cool hot water from the car's engine. The water is passed through the radiator which has air flowing over it.

E. Making a spacecraft's heat shield. The shield has to protect the spacecraft's metal body from burning. Fast moving spacecraft get very hot when entering the Earth’s atmosphere.