G 05 : Acceleration (rate of increase of speed) caused by gravity, e. g. acceleration of a falling stone = 9. 81 m/s2 (metres per second each second), (32 ft/s2)
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}