Table 1.

Basic Physical Properties of Carbonyl Sulfide and Other Biologically Relevant Gaseous Molecules Receiving Attention as Confirmed or Potential Gasotransmitters

Physical property	COS	H2S	NO	CO	SO2	NH3
Molecular weight (g/mol)	60.08	34.08	30.01	28.01	64.06	17.03
Density (g/L)	2.51	1.36	1.34	1.14	2.63	0.769
Melting point (°C)	−138.8	−82	−164	−205.0	−72	−77.8
Boiling point (°C)	−50.2	−60	−152	−191.5	−10	−33.3
Dipole moment (D)	0.65	0.97	0	0.12	1.62	1.42
Solubility (H2O, mol/L, 25°C)	2.0 × 10−2	1.1 × 10−1	1.9 × 10−3	9.9 × 10−4	1.5	31

CO, carbon monoxide; COS, carbonyl sulfide; H₂S, hydrogen sulfide; NH₃, ammonia; NO, nitric oxide; SO₂, sulfur dioxide.