alleryStart learning →Which plot of gas data taken at constant temperature gives a straight line?
APressure against volume
BInverse pressure against volume
CPressure against temperature
DVolume against inverse volume
Answer & Solution
Correct answer: B. Inverse pressure against volume
1. At constant temperature the product of pressure and volume is a constant.
2. Rearranged, that says one over pressure equals volume divided by the constant, which is the equation of a straight line.
3. So plotting the inverse of pressure against volume gives a straight line.
4. Plotting pressure itself against volume gives a hyperbola, which is hard to read accurately at the extremes.
5. Scientists straighten curved data like this precisely because straight lines are easier to read and to fit.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law_
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