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Burning a candleAs a candle burns oxygen is used and heat and water are produced. A few sensors can be used to monitor this process. A light sensor indicates when the candle is extinguished, a humidity sensor measures the water produced while an oxygen sensor monitors the oxygen level. What you needCandle, bell jar, matches, interface and temperature, light, oxygen and humidity sensors. Setting upSet up the candle and sensors inside the bell jar and arrange them so that the probes
will be well away from the candle flame. QuestionsHow does the graph show you the candle produces heat? Teacher questionSome people feel it is important to calibrate the oxygen sensor to read in absolute units. What do you think? Click here to respond. This activity was adapted by Roger Frost from The IT in Science book of Data logging and Control. This page is � IT in Science. It may be reproduced only for use within your school. |
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