5. CHARACTERISTICS OF RESPIRATORY MEDIA 



The solvents, water or nitrogen, through which exchange of O2 and CO2 occur, are the primary substances 

 mechanically inspired by animals that actively ventilate the respiratory organ. Values in parentheses are relative 

 coefficients with O^ as unity. 



/I/ Averages of many determinations; vary widely with conditions of measurement. /2/ Varies, but never absent 

 and always of biological significance. /3/ Calculated for 50% relative humidity. /4/ Calculated. /5/ Calculated 

 from measured value for O2 (20OC) and relative coefficients (18°- 19°C). 



Contributor : McCutcheon, F. H. 



References ; [1] Heilbrunn, L. V., "General Physiology," Philadelphia: W. B. Saunders Co., 1952. [2] Hodgman, 

 C. D., "Handbook of Chemistry and Physics," Cleveland: Chemical Rubber Publishing Co., 1948. [3] Krogh, A., 

 J.Physiol., Lond.22:391, 1919. [4] Pearse, A. S., "Animal Ecology, " New York: McGraw-Hill, 1939. 

 [5] Sverdrup, H. U., Johnson, M. W., and Fleming, R. H., "The Oceans," New York: Prentiss- Hall, 1946. 



6. CHARACTERISTICS OF RESPIRATORY MOLECULES 



Values, unless otherwise indicated, are for standard conditions (STP) of temperature (0°C) and pressure (760 mm 

 Hg). 



/I/ Range indicates variations with method of measurement (e.g., viscosity, heat conductivity). Ill Water vapor in 

 saturated air, i.e., in equilibrium with water, at 0°C and 30°C. 



Contributor : McCutcheon, F. H. 



References : [ l) Dorsey, N. E., "Properties of Ordinary Water Substances in All Its Phases," New York: Reinhold, 

 1940. [2] Hodgman, C. D., "Handbook of Chemistry and Physics, " Cleveland: Chemical Rubber Publishing Co., 

 1948. 



