And as the specific gravity of air is so very small, compared with that of the dense solid materials of which the walls, floor and ceiling of the rooms are constructed, the warming of this air will not sensibly cool the room.
Hence we see how easy it is to ventilate warm rooms in cold weather, and also how impossible it would be to live in such as room without the air in it being perpetually changed and replaced with fresh and pure air from without.
_ Rumford in "Of the Salubrity of Warm Rooms", Vol III, Collected Works, 1796.
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