1. To measure the concentrations of mercury vapor at small (1 thermometer) and large (5 mL) amount of mercury spill. 2. To measure the concentrations of mercury vapor spill at 25oC and 30oC environment. 3. To measure the concentrations of mercury vapor at 1.0 m, 2.0 m and 3 m radius from the source of spill. 4. To measure the concentrations of mercury vapor at 0.1 m, 0.75 m and 1.5 m height from the source of spill. 5. To measure the concentrations of mercury vapor at different duration of 30, 60, 90, and 120 min from the time of spill. This study is an experimental study which conducted to determine the indoor concentrations of mercury vapor following various spill scenarios.