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A fire burns fuel to produce heat and gasses. Some of the heat comes off as visible light and some warms the air in and around the fire and this rises with the smoke.

However, allot of the heat comes off as infra red radiation - a form of light that you can not see with your eyes, but that you can feel with your skin (as the warmth from the fire).

Your skin is always trading heat with its surroundings, your body is always losing heat at a moderate rate to the air touching it. When more heat comes in than goes out, the skin feels warm. So the side of you that faces a fire will feel hot because it is getting more heat than it is losing (because it is absorbing the infra red radiation), while your back surface is shaded from the fire's energy (by your front) and this will be losing more heat than it is receiving and will therefore feel cold.

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Related Questions

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