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Table 3 Volume comparison H2 vs. He

From: Long permanence high altitude airships: the opportunity of hydrogen

Altitude Density H2 Density He V(H2) Veff (H2) V(He) Veff (He)
[m] kg/m3 kg/m3 [m3] [m3] [m3] [m3]
0.00 0.08953 0.17777 319251 351176 346150 380765
1000.00 0.08125 0.16132 351806 386986 381448 419593
2000.00 0.07356 0.14606 388561 427417 421300 463430
3000.00 0.06644 0.13193 430176 473194 466421 513064
4000.00 0.05987 0.11887 477437 525181 517665 569431
5000.00 0.05380 0.10682 531278 584406 576042 633647
6000.00 0.04821 0.09573 592821 652104 642771 707048
7000.00 0.04308 0.08555 663413 729754 719310 791241
8000.00 0.03838 0.07621 744681 819149 807425 888168
9000.00 0.03408 0.06767 838607 922467 909265 1000192
10000.00 0.03016 0.05989 947603 1042364 1027446 1130190
11000.00 0.02660 0.05281 1074645 1182109 1165191 1281710
12000.00 0.02272 0.04511 1258196 1384016 1364208 1500629
13000.00 0.01940 0.03853 1473098 1620408 1597218 1756939
14000.00 0.01657 0.03291 1724708 1897178 1870027 2057029
15000.00 0.01415 0.02811 2019282 2221211 2189421 2408363
16000.00 0.01209 0.02401 2364179 2600597 2563378 2819716
17000.00 0.01033 0.02050 2767981 3044779 3001202 3301323