A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . ould here observe on the importance of keeping in mindthis double relation of weight and volume^ and the atomic consti-tution of these gases, as it will prevent much of that confusionwhich too often embarrasses those who are not familiar withthe subject of gaseous combinations. Let us now, in the same analytical manner, examine an atomof atmospheric air, the other ingredient in combustion. Atmospheric air is compos
A practical treatise on the construction, heating and ventilation of hot-houses; : including conservatories, green-houses, graperies and other kinds of horticultural . ould here observe on the importance of keeping in mindthis double relation of weight and volume^ and the atomic consti-tution of these gases, as it will prevent much of that confusionwhich too often embarrasses those who are not familiar withthe subject of gaseous combinations. Let us now, in the same analytical manner, examine an atomof atmospheric air, the other ingredient in combustion. Atmospheric air is composed of two atoms of nitrogen and oneatom of oxygen: and here again we find a great disproportionbetween the relative volumes of these constituents; one atom ofnitrogen being double the volume of an atom of oxygen, whiletheir relative weights are as 14 to 8: the gross volume of thenitrogen, in air, being thus four times that of the oxygen; andin weight, as 28 to 8, as shown in the aimexed figure. Atmospheric Air, (or thus,) Atmospheric Air. I atom ofNitrogen,weight 14. 1 atom ofNitrogen,weight 14. 1 atom ofOxygen, 8. u < o u- o 1-^ o -J to B % < « V, % o s o *J cd i-H. Here we are relieved from the complexity arising out of anydifference in volume between these constituents, when united andwhen separate. In the coal gas we found the constituents con-densed into tioo fifths of their gross bulk when separate : this,we see, is not the case with air ; an atom of which is the same,both as to bulk and weight, as the sum of its constituents. relation between volumes and half volumes. As, however, I shall have todo with masses of these gases, I have adopted circular figures, the rela-tion between the sizes of the volumes of the different gases being thesame. 138 HEATING. Thus, we find, the oxygen — the heat-giving constituent ofthe air — bears a proportion in volume to that of the nitrogen, as1 to 5 ; there being, in fact, but 20 per cent, of oxygen in atmospheric air, and no
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