Complete the instructions below on how to do an experiment. Decide if each word or phrase in brackets should have a/an, the or some in front of it, or if it should have none of these words.
Push (metal
rod) through (cork) and then put two pins into (cork), as in Picture 1. Take
two more corks and push (nails) into them. Put (pins) on two glasses and move
(cork) to (right place) so that it balances, as in Picture 2. Then you need
(candle) and (matches). Stand (candle) on (saucer) under one side of (rod) and
light it. (Heat) that comes from (candle) will make (metal) expand (= grow
bigger). This extra length will make (rod) fall, as in Picture 3. (Experiment)
shows that (heat) makes (metal) expand.
Write about
this experiment, which shows that air has weight. Here are some words ydu can
use: thin, wood, table, stick out, edge, paper, hammer, hit, break, air, press
down, weight.
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