Note 44 — Chapter VI · TTHE COMPOUNDS OF NITROGEN WITH HYDROGEN AND OXYGEN

According to certain investigations, if a brown liquid is formed from the melted crystals by beating above -9°, then they no longer solidify at -10°, probably because a certain amount of N2O3 (and oxygen) is formed, and this substance remains liquid at -30°, or it may be that the passage from 2NO2 into N2O4 is not so easily accomplished as the passage from N2O4 into 2NO2.

Liquid nitrogen peroxide (that is, a mixture of NO₂ and N₂O₄) is employed in admixture with hydrocarbons as an explosive.