When we start the engine on a cold day (below freezing point) there is condensed water vapor (mist) coming from the exhaust. When the engine and the exhaust get hot there is no more water vapor mist coming from the exhaust. Why? When moist hot gases exit the hot exhaust they enter very cold air and water vapor starts to condense, isn't it? Why we don't see it? We see it while it comes out from cold exhaust?
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