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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