PMID: 2503494Jul 1, 1989Paper

Effects of temperature and composition on the viscosity of respiratory gases

Journal of Applied Physiology
M J TurnerA D Rothberg

Abstract

The steady-state sensitivity of resistance pneumotachographs is proportional to viscosity. Dynamic characteristics of pneumotachographs, pressure transducers, and mass spectrometers are also viscosity dependent. We derive linear equations to approximate the viscosities of O2, N2, CO2, H2O, He, N2O, and Ar for temperatures between 20 and 40 degrees C by using published viscosity data and a nonlinear extrapolation equation. We verify the accuracy of the extrapolation equation by comparison with published data. Our linear equations for pure gas viscosities yield standard errors less than 0.35 microP. We also compare a nonlinear equation for calculating the viscosities of mixtures of gases with published measured viscosities of dry air, humid air, and He-O2 and N2-CO2 mixtures. The maximum difference between published and calculated values is 1.3% for 10% CO2 in N2. All other differences are less than 0.38%. For saturated humid air at 35 degrees C, a linear concentration-weighted combination of viscosities differs from our nonlinear equation by 4.9, 2.1, and 1.7% at barometric pressures of 32, 83, and 100 kPa, respectively. By use of our method, the viscosity of normal respiratory gases can be calculated to within 1% of measured va...Continue Reading

Citations

Dec 12, 2001·American Journal of Respiratory and Critical Care Medicine·R B FogelD P White
Jan 10, 2002·American Journal of Respiratory and Critical Care Medicine·Atul MalhotraDavid P White
Mar 1, 1990·Medical & Biological Engineering & Computing·M J TurnerA D Rothberg
Feb 22, 2013·Archives of Disease in Childhood. Fetal and Neonatal Edition·Jonathan KaufmanPeter G Davis
Apr 7, 2010·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·John ValenzaDavid Linton Johnson
Nov 8, 2011·The Journal of Pediatrics·Georg M SchmölzerPeter G Davis
Jun 1, 1995·Molecular and Biochemical Parasitology·Y L NagoshiJ E Donelson
Mar 7, 2002·British Journal of Anaesthesia·W HabreF Petak

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