Hydrogen Sulfide - Thermophysical Properties
Comprehensive thermophysical properties of hydrogen sulfide (H2S), a colorless, toxic, flammable gas with applications in chemical manufacturing and metallurgy. Properties include critical parameters, density, thermal conductivity, viscosity, and phase behavior at standard conditions (25°C, 1 bara) and various temperatures.
| Property | Value 1 | Unit 1 | Value 2 | Unit 2 | Value 3 | Unit 3 | Value 4 | Unit 4 |
|---|---|---|---|---|---|---|---|---|
| Autoignition temperature | 505 | K | 232 | °C | 450 | °F | ||
| Boiling Point | 213.6 | K | -59.55 | °C | -75.2 | °F | ||
| Critical density | 10.2 | mol/dm³ | 348 | kg/m³ | 0.675 | slug/ft³ | 21.7 | lb/ft³ |
| Critical pressure | 8.97 | MPa | 89.7 | bar | 88.5 | atm | 1301 | psi |
| Critical temperature | 373.3 | K | 100.2 | °C | 212.3 | °F | ||
| Critical volume | 98 | cm³/mol | 0.00288 | m³/kg | 1.48 | ft³/slug | 0.0461 | ft³/lb |
| Density (gas) | 44.16 | mol/m³ | 1.505 | kg/m³ | 0.00292 | slug/ft³ | 0.0940 | lb/ft³ |
| Density (liquid) at -85.5°C | 29116 | mol/m³ | 992.3 | kg/m³ | 1.925 | slug/ft³ | 61.95 | lb/ft³ |
| Density (liquid) at -60°C | 26877 | mol/m³ | 916.0 | kg/m³ | 1.777 | slug/ft³ | 57.18 | lb/ft³ |
| Flammable (gas and liquid) | yes | |||||||
| Flash point | 480 | K | 207 | °C | 405 | °F | ||
| Gas constant, individual - R | 244.0 | J/kg·K | 0.06777 | Wh/(kg·K) | 1459 | (ft·lbf/slug·°R) | 45.34 | (ft·lbf/lb·°R) |
| Gibbs free energy of formation (gas) | -34 | kJ/mol | -998 | kJ/kg | -429 | Btu/lb | ||
| Heat of formation (gas) | -20.6 | kJ/mol | -604 | kJ/kg | -260 | Btu/lb | ||
| Heat of sublimation at -98°C | 25.4 | kJ/mol | 745 | kJ/kg | 320 | Btu/lb | ||
| Heat of evaporation at -73°C | 20.00 | kJ/mol | 353.4 | kJ/kg | 151.93 | Btu/lb | ||
| Heat capacity, Cp (gas) | 34.6 | J/mol·K | 1.01 | kJ/kg·K | 0.242 | Btu/lb·°F | ||
| Specific heat capacity, Cp (liquid) at 20 bara | 76.5 | J/mol·K | 2.24 | kJ/kg·K | 0.536 | Btu/lb·°F | ||
| Specific heat capacity, Cv (gas) | 26.0 | J/mol·K | 0.76 | kJ/kg·K | 0.182 | Btu/lb·°F | ||
| Specific heat capacity, Cv (liquid) at 20 bara | 37.0 | J/mol·K | 1.09 | kJ/kg·K | 0.259 | Btu/lb·°F | ||
| Ionization potential | 10.46 | eV | ||||||
| Melting point | 187.66 | K | -85.5 | °C | -121.9 | °F | ||
| Molecular Weight | 34.081 | g/mol | 0.07514 | lb/mol | ||||
| Solubility in water at 25°C | 4 | mg/ml | ||||||
| Sound velocity in gas | 309 | m/s | 1014 | ft/s | 692 | mi/h | ||
| Sound velocity in liquid at 20 bara | 836 | m/s | 2742 | ft/s | 1873 | mi/h | ||
| Specific Gravity (gas) relative to air | 1.19 | |||||||
| Specific Gravity (liquid) relative to water | 0.92 | |||||||
| Specific Heat Ratio (gas) - Cp/Cv | 1.33 | |||||||
| Specific Heat Ratio (liquid) - Cp/Cv at 20 bara | 2.07 | |||||||
| Specific Volume (gas) | 0.023 | m³/mol | 0.66 | m³/kg | 342.44 | ft³/slug | 10.64 | ft³/lb |
| Specific Volume (liquid) at -85.5°C | 0.0000343 | m³/mol | 0.00101 | m³/kg | 0.519 | ft³/slug | 0.0161 | ft³/lb |
| Standard molar entropy, S° (gas) | 206 | J/mol·K | 6.04 | kJ/kg·K | 1.44 | Btu/lb·°F | ||
| Surface tension at 125°C | 58.1 | dynes/cm | 0.0581 | N/m | ||||
| Thermal Conductivity | 0.018 | W/m·°C | 0.010400 | Btu/hr·ft·°F | ||||
| Triple point pressure | 0.0233 | MPa | 0.233 | bar | 0.230 | atm | 3.38 | psi |
| Triple point temperature | 187.63 | K | -85.5 | °C | -121.94 | °F | ||
| Vapor saturation pressure | 2.0262 | MPa | 15200.0 | mm Hg | 19.9971 | atm | 293.88 | psi |
| Viscosity, dynamic (absolute) | 0.013 | cP | 8.6 | (lbm/ft·s ×10⁻⁶) | 0.27 | (lbf·s/ft² ×10⁻⁶) | ||
| Viscosity, kinematic | 8.505 | cSt | 91.5 | (ft²/s ×10⁻⁶) |