Chapter 1 Flashcards
Normal- fresh air exists at _____ oxygen concentration in the atmosphere.
20.9%
Acceptable low oxygen as defined by OSHA exists between ________
20.9%- 19.5%
OSHA CFR 1910.134 defines an oxygen deficient atmosphere as one with oxygen concentration of less than_____
19.5%
Firefighters should not enter atmospheres with temperatures exceeding ________ without protective clothing and full respiratory protection.
120 degrees Fahrenheit
Carbon monoxide
Odorless, colorless, flammable gas, is slightly lighter than air.
Department standards dictate that SCBA will be utilized when the concentration of carbon monoxide exceeds _________
35 ppm (.0035 percent)
3200 ppm or (.32 percent), carbon monoxide is an extremely lethal gas, causing unconscious in ________
30 minutes
12800 ppm (1.28 percent), unconsciousness occurs immediately upon exposure, with death following in_________
One to three minutes
Hydrogen sulfide
Foul odor of “rotten eggs”
Heavier than air, poisonous, corrosive, flammable and explosive.
Incomplete combustion of living things, wool, rubber and hair.
Sulfur dioxide
Complete oxidation of sulfur containing materials such as wool, rubber and some woods.
Extremely irritating on eyes and respiratory tract.
Quantity produced by combustion is too small to be toxic.
Normal concentration of carbon dioxide in the atmosphere is
300 ppm (.03 percent)
Carbon dioxide lethal concentration
100,000 to 200,000 (10-20 percent)
Hydrogen cyanide
“Bitter almond” odor
Caused by incomplete combustion of nitrogen containing materials such as wool, nylon, polyurethane foam, rubber and paper.
Phosgene
“Musty hay” odor
Colorless gas produced when refrigerants such as Freon encounter flame.
The earths atmosphere
21 percent oxygen
78 percent nitrogen
1 percent other gases
