. Ventilation for dwellings, rural schools and stables. ifferent temperatures. Temperature. Pure 2 .03%HgO .55%N Respired 2 70° .074316 .075961 .077605 .079249 .080894 Saturated 075223 64 60 .076884 50 078544 40 .080205 30. 081865 Here it is seen that air changed in composition by beingrespired and cooled to temperatures between 70° and 30° is heavier than pure air atthe same temperature. Assoon as respired air cools be-low the temperature at whichit becomes saturated by itscontained moisture a portionof this
. Ventilation for dwellings, rural schools and stables. ifferent temperatures. Temperature. Pure 2 .03%HgO .55%N Respired 2 70° .074316 .075961 .077605 .079249 .080894 Saturated 075223 64 60 .076884 50 078544 40 .080205 30. 081865 Here it is seen that air changed in composition by beingrespired and cooled to temperatures between 70° and 30° is heavier than pure air atthe same temperature. Assoon as respired air cools be-low the temperature at whichit becomes saturated by itscontained moisture a portionof this must be condensed,leaving it heavier because ofthis loss of moisture. Thus,in the colume of respired air,,it is seen that it becomes sat-urated at 64° and when it iscooled to 50°, instead ofreally having the weightthere stated, on the basis thatit could contain 2 volume porcent of moisture at that tem-perature, its actual weightwhen saturated is .078765pound per cubic foot, whichi>s per cent heavier thanpure air at the same Fig. 28.—Inverted Jar beingfilled with respired air. Density of Respired Air. 6^ That respired air, when surrounded by pure air, eitherrises very slowly or tends actually to fall may be clearlydemonstrated. Let the Mason jar earlier used be inyerted^Fig. 28, while air from the lungs is made to displace thatwhich it contains. With the candle already lisrhted Ir-t thejar be at once lowered overit, Fig. 29. The flame is ex-tinguished as it was in anearlier experiment when thecandle was lowered into thejar filled with respired if the trials are now re-peated with the jar both in-verted and placed withmouth up it will be found.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectventilation, bookyear
