TY JOUR TI EXPERIMENTAL DETERMINATION OF THE AREA OF THE SPILL OF THE MAIN TYPES OF POISONING SUBSTANCES ACCORDING TO THE UNDERLYING SURFACE KW chemically hazardous object KW emergency chemically hazardous substances KW the ratio of the surface of the spreading JO NATURAL AND MAN-MADE RISKS (PHYSICO-MATHEMATICAL AND APPLIED ASPECTS) AU Savchuk, O.N. AU Aksenov, A.A. PY 2019 IS 2019 PB Saint-Petersburg University of State Fire Service of Emercom of Russia