CONDUCTION, CONVECTION
1.
Equal amounts of hot coffee are poured into two cups. The two cups are exactly
the same shape and size but one is made of polystyrene and the other is made of
tin.
(a)
Which cup will keep the coffee hotter for longer?
…………………………………………………………………………………………………….…
(b)
Why is this?
……………………………………………………………………………………………………….
2.
Complete the sentences using one of the following words for each space:
conduction
convection insulator conductor
(a)
a metal is a better ………………………… of heat than plastic
(b)
hot air rising up a chimney is called
…………………………………………………………..
(c)
Plastic is a good
………………………………………………………………………….
(d)
heat is transferred along a metal rod by
…………………………………………….………..
(e)
a thick woolly jacket round a hot water cylinder is a good …………………………...…….
(f)
iron is a better ……………………………. of heat than air
3.
The handle of a saucepan should be made of
………………………………….. because it
is
a bad conductor of heat.
4.
You stir some tea with a plastic spoon and a metal spoon (both spoons are the
same size). Which one will you feel getter hotter first.
……………………………………………………………………………………………………….
5.
Heat flows along a plastic rod because the
……………………………………. in the rod
vibrate
and collide with each other.
6.
Write down four places where convection is important in a home:
(a)
…………………………………………………………………………………………………
(b)
…………………………………………………………………………………………………
(c)
………………………………………………………………………………………………….
(d)
………………………………………………………………………………………………….
