In my case, pressure is the independent variable (plotted on the x-axis), and volume is the dependent variable (plotted on the y-axis).
In analogy to “xy”-plot, I’d say I get a “pressure-volume (P-V)” curve, although y is plotted against x.
However, I find it both ways (i.e. P-V vs. V-P) in the literature, even within the field of pulmonology/lung mechanics (Levitzky 1982, West 2012 vs. Frank et al. 1959, Leith 1976).
Does a (binding) convention exist in general (mathematics) or specifically in the field of lung physiology?
References:
- Frank NR, Radford EP Jr, Whittenberger JL (1959) Static volume-pressure interrelations of the lungs and pulmonary blood vessels in excised cats’ lungs. Journal of Applied Physiology 14: 167–173.
- Leith DE (1976) Comparative mammalian respiratory mechanics. The Physiologist 19: 485–510. http://www.the-aps.org/mm/Publications/Journals/Physiologist/1970-1979/1976
- Levitzky MG (1982) Pulmonary physiology. McGraw-Hill, Inc. (New York): 13–50. ISBN 0-07-037431-7
- West JB (2012) Respiratory physiology: The essentials, Ninth edition. Lippincott Williams & Wilkins (Philadelphia): 95–124. ISBN 978-1-60913-640-6
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