Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Hydrogen sulfide - Thermophysical Properties

Sponsored Links

Hydrogen sulfide, H2S, is a highly toxic and flammable, colorless gas with a characteristic odor of rotten eggs. It is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent.  It is heavier than air and tends to accumulate at the bottom of poorly ventilated spaces. Although very pungent at first, it quickly deadens the sense of smell.

Hydrogen sulfide occurs naturally in crude petroleum, natural gas, volcanic gases, and hot springs. It can also result from bacterial breakdown of organic matter. It is also produced by human and animal wastes.

Hydrogen sulfide is used in the manufacture of chemicals, in metallurgy, and as an analytical reagent.

The phase diagram of hydrogen sulfide is shown below the table.

Chemical, physical and thermal properties of hydrogen sulfide:
Values are given for gas phase at 25 oC /77 oF / 298 K and 1 bara, if not other phase, temperature or pressure given.

For full table with Imperial Units - rotate the screen!

Hydrogen sulfide - Thermophysical Properties
Property Value Unit Value Unit Value Unit Value Unit
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=MN/m2 89.7 bar 88.5 atm 1301 psi=lbf /in2
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 -121.9 °F/-85.5°C 29116 mol/m3 992.3 kg/m3 1.925 slug/ft3 61.95 lb/ft3
Density (liquid) at -76 °F/-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 (enthalpy) of formation (gas) -20.6 kJ/mol -604 kJ/kg -260 Btu/lb
Heat (enthalpy) of sublimation,at -145°F/-98°C 25.4 kJ/mol 745 kJ/kg 320 Btu/lb
Heat (enthalpy) of evaporation at-100°F/-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 or cal/g K
Specific heat capacity, Cp (liquid) at 20 bara 76.5 J/mol K 2.24 kJ/kg K 0.536 Btu/lb°F or cal/g K
Specific heat capacity, Cv (gas) 26.0 J/mol K 0.76 kJ/kg K 0.182 Btu/lb°F or cal/g K
Specific heat capacity, Cv (liquid) at 20 bara 37.0 J/mol K 1.09 kJ/kg K 0.259 Btu/lb°F or cal/g K
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) (relativ to air) 1.19
Specific Gravity (liquid) (relativ 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 -121.9 °F/-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 257°F/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=MN/m2 0.233 bar 0.230 atm 3.38 psi=lbf /in2
Triple point temperature 187.63 K -85.5 °C -121.94 °F
Vapor (saturation) pressure 2.0262 MPa=MN/m2 15200.0 mm Hg 19.9971 atm 293.88 psi=lbf /in2
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 ]
.

See more about atmospheric pressure , and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure ,
as well as Thermophysical properties of: Acetone , Acetylene , Air , Ammonia , Argon , Benzene , Butane , Carbon dioxide , Carbon monoxide , Ethane , Ethanol , Ethylene , Helium , Hydrogen , Methane , Methanol , Nitrogen , Oxygen , Pentane , Propane , Toluene , Water and Heavy water, D2O .

Hydrogen sulfide is a gas at standard conditions. However, at low temperature and/or high pressures the gas becomes a liquid or a solid.

The hydrogen sulfide phase diagram shows the phase behavior with changes in temperature and pressure. The curve between the critical point and the triple point shows the hydrogen sulfide boiling point with changes in pressure. It also shows the saturation pressure with changes in temperature.

At the critical point there is no change of state when pressure is increased or if heat is added.

The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.

Sponsored Links

Related Topics

• Fluid Mechanics

The study of fluids - liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time.

• Material Properties

Properties of gases, fluids and solids. Densities, specific heats, viscosities and more.

• Thermodynamics

Work, heat and energy systems.

Related Documents

Acetone - Thermophysical Properties

Chemical, physical and thermal properties of acetone, also called 2-propanone, dimethyl ketone and pyroacetic acid. Phase diagram included.

Benzene - Thermophysical properties

Chemical, physical and thermal properties of benzene, also called benzol. Phase diagram included.

Ethylene - Thermophysical Properties

Chemical, physical and thermal properties of ethylene, also called ethene, acetene and olefiant gas. Phase diagram included.

Pentane - Thermophysical Properties

Chemical, physical and thermal properties of pentane, also called n-pentane. Phase diagram included.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.