PT Journal AU MARKOVA, I TI EVALUATION OF DEMONSTRATION EXPERIMENT IN TEACHING THE SUBJECT DANGEROUS SUBSTANCES SO Trends in education PY 2012 BP 488 EP 491 VL 5 IS 1 DE release of hazardous substances; IT. AB Demonstration experiment is a good didactic tool for teaching technical subjects. The obtained data from the experiment are scanned mathematical software then evaluated. The paper deals with the presentation of the demonstration evaluation trial - monitoring the effectiveness of gaseous fire extinguishing agents in the subject of hazardous substances in the study 8.3 Security Services. ER