Unit 7.2

HEAT CONDUCTORS & HEAT INSULATORS

1

CONDUCTORS

a) Are substances which conduct heat rapidly

b) Metal are good conductors of heat.

c) Good conductor become hot @ cold quickly

2

INSULATORS

a) Are poor conductors @ substances which do not conduct heat.

b) Non-metals, liquids (except mercury) & gases are insulators.

3

conductors

silver

copper

aluminium

zinc

iron

lead

mercury

INSULATORS

AIR,VACUUM

ASBESTOS

PLASTIC

POLYSTYRENE

WATER,ICE

GLASSRUBBE

R WOOD

FELT,COTTO

N

Guess it!

6

Guess it!

7

Uses of heat conductors in daily life

8

Cooking utensils Conduct heat quickly and easily to the food and thus save fuels

Electrical appliances made of iron or stainless steel that conducts heat well.

Uses of heat insulators in daily life

9

Asbestos sheets To prevent table from being damaged by hot kitchenware or objects

Woolen blanket Keep the body warm on cold days.

Polystyrene foam Keep food warm.

10