Worksheet VI – Extinguish part 2

Worksheet VI – Extinguish part 2
Fire Science Virtual Laboratory

Directions:
The virtual laboratory is located on the www.firesciencetools.com website. Here is a direct link to the virtual laboratory.

Each of the six sections should take around 20 minutes to complete.
If any of the videos do not play for some reason, make a note on the sheet and move on to the next one.

a. Storm proof matches vs. water proof matches vs. normal matches in water
Does the water extinguish the strike anywhere match? ______________
Does the water extinguish the water proof match? _________________
Does the water extinguish the storm proof match? __________________
The storm proof match has an oxidizer and fuel mixture along the wooden stick. What does this tell you about trying to extinguish fires involving oxidizers with water? ____________________________________________________________________________________________________________________________________________________________________________________
b. Butane lighter in water
Does the water extinguish the butane diffusion flame? _________________________

c. Matches in CO2:
Does the normal match continue to burn once it is submerged in the CO2 gas? ___________________
Does the storm proof match continue to burn after it is submerged in the CO2 gas? ________________

What does this tell you about using clean agent systems to put out fires involving oxidizers? ____________________________________________________________________________________________________________________________________________________________________________________

d. Pouring CO2 on smouldering steel wool:
Does the carbon monoxide gas extinguish the smouldering steel wool? ______________

e. Reigniting steel wool after extinction:
Watch videos of reigniting steel wool after extinguishment using CO2 and extinguishment using water.

The CO2 is a clean agent. Does the CO2 prevent re-ignition once the steel wool is removed from the beaker filled with the gas? __________________________

Does the steel wool reignite after being extinguished using water? ____________________
What does this tell you about the risks of a rekindling fire after being extinguished by a clean agent system? ____________________________________________________________________________________________________________________________________________________________________________________