Physics Division

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Introduction

Reference Material

Policy and Requirements

Methods of Compliance

Operational Requirements

Appendices

1.

Properties of Liquids

2.

Relief Valve Sizing

2a.

Convective Heat Transfer

2b.

Relief Vent Pressure Drops

3.

Oxygen Deficiency Hazards

APPENDIX 1: Physical Properties of Cryogenic Liquids

Properties

He

H2

Ne

N2

Ar

O2

CO2

Boiling point(1 atm), K

4.2

20.3

27.1

77.3

87.3

90.2

194.7†

Critical temperature, K

5.2

33.0

44.4

126.3

150.9

154.8

304.2

Critical pressure, atm

2.2

12.8

26.2

33.5

48.3

50.1

72.8

Liquid density, g/ℓ 

125

71

1206

808

1402

1410

1560*

Gas density (300 K), g/ℓ

0.16

0.082

0.82

1.14

1.63

1.3

2.0

Gas/Liquid expansion ratioat STP   (Vg/V)

780

865

1470

710

860

875

790


†Sublimation Point
*Solid at 1 atm