We know that the weight of a cubic foot of air at 0℃，and 76cm，pressure is 0.08l pound, or 12 cubic feet of air weigh a pound.
We know that the weight of a cubic foot of air at 0℃，and 76cm，pressure is 0.08l pound, or 12 cubic feet of air weigh a pound.
我们知道，1立方英尺的空气在0摄氏度和760毫米汞柱压力下，重量是0.81磅，也就是说12立方英尺空气的重量是1磅。