Page:The chemical history of a candle.djvu/137

Rh pint of nitrogen weighs $10 4⁄10$ grains, or a cubic foot weighs $1 1⁄6$ ounce. That is the weight of the nitrogen. The oxygen is heavier: a pint of it weighs $11 9⁄10$ grains, and a cubic foot weighs $1 3⁄4$ ounce. A pint of air weighs about $10 7⁄10$ grains, and a cubic foot $1 1⁄6$ ounce.

You have asked me several times, and I am very glad you have, "How do you weigh gases?" I will shew you; it is very simple, and easily done. Here is a balance, and here a