Formic acid

 Lower explosion limit% (V / V): 18.0

 Explosive limit% (V / V): 57.0

 Ignition temperature (): 410

Flash Point (): 68.9 (O.C)

 Critical pressure (MPa): 8.63

 Critical Temperature (): 306.8

 Heat of combustion (kJ / mol): 254.4

 Saturated vapor pressure (kPa): 5.33 (24 )

 Relative vapor density (air = 1): 1.59

 Relative density (water = 1): 1.23

 Boiling Point (): 100.8

Melting Point (): 8.2

Appearance and traits: colorless, transparent liquid smoke, there is a strong irritant sour.