How did Jacques Charles know about the behavior of gases at very low temperatures?
Answer:
Well that just it isn't it. He was able to find VERY low temperatures easily just by changing the volume of a gas at constant pressure.
for example:
he had a gas at room temp 20ºC = 293 K and V1 = 1 L
Then keeping the pressure of that gas constant he let that gas pass into an evacuated volume of 0.5 L (the final pressure would be the same as the initial pressure so ∆P = 0)
V1/T1 = V2/T2 ==> T2 = V2/V1 *T1
T2 = 293K * 0.5L/1L = 146.5 K = -126.5 ºC much below freezing!
Which make perfect sense - gases will occupy more volume at higher temperature!
He probably farted in the snow.
studued
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