Archives of internal medicine . accepted theory or gas diffusion,the progress of carbon dioxid and air into each other through such apartition and under the conditions given is at the average velocity of a lineal foot per minute.^® The volume of carbon dioxid which 16. The computation of this value is completed from the equation: St ^ X2—NWhere C = the contents of the box in cubic feet, /S = the surface of the curtain in square feet,t = time in minutes,a?! and a?2 = the proportion of carbon dioxid in the box at any two successiveperiods t minutes apart,2V = the proportion of carbon dio
Archives of internal medicine . accepted theory or gas diffusion,the progress of carbon dioxid and air into each other through such apartition and under the conditions given is at the average velocity of a lineal foot per minute.^® The volume of carbon dioxid which 16. The computation of this value is completed from the equation: St ^ X2—NWhere C = the contents of the box in cubic feet, /S = the surface of the curtain in square feet,t = time in minutes,a?! and a?2 = the proportion of carbon dioxid in the box at any two successiveperiods t minutes apart,2V = the proportion of carbon dioxid in the outside air (air of the room),and jE=:the rate per minute (coeflBcient of diffusion, foot-minutes). THOMAS R. CROWDER 119 will so diffuse during any minute through each square foot of curtainsurface is represented by the product of this rate times the concentrationof the carbon dioxid in the box at the beginning of that minute over andabove that in the air outside. In order readily to conceive an equivalent ?50. Chart 12. of what takes place it may be supposed that through each square foot ofcurtain surface essentially cubic feet of the gas mixture in the boxpasses out during each minute, and that an equal volume of the outsideair enters to take its place; but the motion is one of molecules and not 120 TEE ARCEIVES OF INTERNAL MEDICINE of movement in masses. This is about one-half the rate given for diffu-sion between air and carbon dioxid when no partition intervenes.^^ By using boxes having different relations between the oppu surfaceand the cubic contents practically the same result for the vahie of R wasobtained. The twelve series represented by the chart represent points fortaking the samples lying 4, 8, 12 and 16 inches back of the curtain, andshow no essential differences. Assuming that the above established rateof interchange is essentially correct for the conditions represented by aberth, we may compute to what height the carbon dioxid of a berth wo
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