Yep basically what type of light source would be the most dangerous near explosive gas?
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I'm interpreting this question as what type of light would be dangerous in the presence of a combustible gas and not gasoline in liquid form, and that this gas is not contained within a cylinder or a tank. I'll assume the gas is in a free state, in an enclosed room with windows or a container with a glass aperture.
So the light would have to be of a concentration or energy that would ignite a gas in an enclosed room.
A focused beam such as that from optical lenses and sunlight, or from a laser , would have the energy to initiate a combustion by ionizing the gas at the focal point, under the right conditions.
If this is a safety question for storing gas cylinders, they should always be stored in a cool dry place, and out of direct sunlight.
So the light would have to be of a concentration or energy that would ignite a gas in an enclosed room.
A focused beam such as that from optical lenses and sunlight, or from a laser , would have the energy to initiate a combustion by ionizing the gas at the focal point, under the right conditions.
If this is a safety question for storing gas cylinders, they should always be stored in a cool dry place, and out of direct sunlight.
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A simple magnifying glass will ignite wood on a sunny day so it is not exactly the type of light but more the intensity. Certainly anything that could create a spark (which is tough for light). Otherwise, it would have to be intense enough to heat the gas to a high enough temperature that it ignites.