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Wonkee Donkee’s Lesson on Combustible Gases

 Wonkee Donkee’s lesson on combustible gases

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four states of matter, solid, liquid, gas, plasma Gas is one of the four states of matter, the others being liquids, solids and plasma. Gas particles move around freely and can disperse easily.
combustion triangle, oxygen, heat, fuel Combustion is a burning process; in chemical terms it is the reaction of a substance (fuel) with oxygen, producing heat and light.
gas flames from bunsen burner A combustible gas is one of these substances, which when mixed with oxygen and ignited, will burn.
gas detector senses methane, propane, butane, ethanol, ammonia and hydrogen Combustible gases include methane, propane, butane, ethanol, ammonia and hydrogen.
All of these are generally sensed by a gas detector.
gas hob flame If you have a gas hob in your home, it uses combustible gas as its fuel source, as does any other gas flame.
flammable sign Any gas that can burn, under varying circumstances, can be labelled combustible. A flammable gas is a combustible gas that will burn in typical conditions. However, the terms combustible and flammable are sometimes used interchangeably. These conditions usually relate to the concentration of gas and the upper and lower limits of combustibility.

LEL and UEL (lower explosive limit and upper explosive limit)

upper and lower explosive / flammable limits for combustible gases graph Also known as lower and upper flammability limits (LFL and UFL), this is the percentage of gas in the air (concentration) between which gases will catch fire when exposed to an igniter.

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