What did John Dalton use to study gases?
Barometer
Thermometer
Microscope
Telescope
Answer
Barometer: John Dalton used a barometer to study gases. A barometer measures atmospheric pressure, which is the weight of the air above a given point. Dalton used a barometer to measure the pressure of gases at different altitudes. He found that the pressure of a gas decreases as the altitude increases. This is because there is less air above a given point at higher altitudes.
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