Discussion
The explosive or flammability range of a gas is the range of
Answer: A
Correct answer: concentrations in air within which it will propagate a flame
Every flammable gas has a lower and an upper limit, and only between them will a flame started at one point travel through the mixture. Below the lower limit the mixture is too lean to release enough heat to ignite the next layer; above the upper limit there is too little oxygen. Hydrogen’s very wide range, roughly 4 to 75 per cent, is what makes it so hazardous to handle.
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