lect3prt - Observation When wood burned the product(ash...

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Observation: When wood burned, the product (ash) weighed less than the original material Hypothesis? Something, call it pholgiston, is lost upon burning.
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Joseph Priestley Left England to settle (briefly) in nearby Northumberland, PA
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Priestley found that heating “red lead” gave a “good air”—judged by how long a fixed volume of the air thus released sustained a lit candle. (We would say that Pb 3 O 4 PbO + O 2 Though that answer is a bit unbalanced.)
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Priestley’s identification of oxygen (“good air”) as essential to life. Evidence for good air is provided when a mouse is stored in a sealed chamber, with atmospheric air, or air released from the red lead; when a sprig of mint is added, survival can be extended “indefinitely”.
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A “burning lens” apparatus Green chemistry in the 18 th Century
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Mercury Calx An oxide of mercury
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Mercury Calx An oxide of mercury
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Antoine Lavoisier and his wife. By J.-L. David
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Lavoisier’s equipment was the best in the world. The best balances in existence, so he could accurately weigh samples.
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A Gasometer.
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