Labels:book | bulletin board | dialog box | hakham | monitor | web site | window OCR: HELP How long does air last? This simple experiment will help you find out how long oxygen in the air lasts You will need deep tray or trough, glass jar, a piece tubing - candle and some matches Do NOT attempt this experiment if you have asthma or any other respiratory illnesses 1) Fill the trough and jar full of water Ask someone to hold the jar in the trough upside down Place one end of the tube into the jar under the water. 2 Steriise the end of the tube with a sterilising fluid (such as Milton) and breathe through it into the jar. You will find that the water will leave the jar and some air will be trapped 3 Carefully place the jar over alit candle 4 Time the candle untilit goes out Write the result in your note book Repeat the exper imen several times and work out the average time the ...
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