Hydrodynamic : Relating to the forces acting on or exerted by liquids in motion. Hydrogen. H, Colourless, odourless, diatomic gas. Flammability limits of hydrogen-air mixtures 4-74% by volume
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}