Show air at higher altitudes altitude r except for dust and water vater vapor orpo I 1 the composition of the air does doe lot DOI of the cla change e up to the lower limit lesal lid miles ni seven about stratosphere at resulting es 1 B tude the constant mixing from the cinq wind keeps tile the proportions proportion pro that portio albl au of the ft gases ases constant above ob 0 e s vary D may av tude these proportions J tribune servos serves a writer in the chicago level w the the higher we go above thit that find to larger proportion we expect v cabure of the lighter gases actual bear 0 ma 3 23 as ments made as high out this prediction from co c the cal formula we can estimate aglid 4 it la a position at higher levels Is ae t f at 60 there Is almost no oxygen at g 1 75 miles and no nitrogen at ala altitude the all air or what little 80 d t ot of it consists chiefly of hydrogen gen |