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what had Priestly done to introduce the mint plant without disturbing the experiment set up?

Asked by Praveen 14th July 2015, 5:47 AM
Answered by Expert
  • Priestley observed that a burning candle would get extinguished in a closed bell jar.
  • In August 1771, Joseph Priestley conducted another set of experiments where he placed a mint plant into a transparent closed space with a burning candle that eventually burned out the air until it soon went out.
  • Priestly discovered that the relit candle burned perfectly well in the air that previously would not support it.
  • In another experiment conducted in 1772, Priestley kept a mouse in a jar of air until it collapsed. He found that a mouse kept with a plant would survive. 
  • After 27 days, he relit the extinguished candle again.
  • These kinds of observations led Priestley to offer an interesting hypothesis that plants restore to the air whatever breathing animals and burning candles remove - what was later coined by Lavoisier as "oxygen".
  • In these experiments, Priestly was the first to observe that plants release oxygen into the air by the process of photosynthesis.
Answered by Expert 14th July 2015, 10:58 AM
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