For 3 reasons: 1/ Simple chimneys take the smoke away from a fire because the warm air inside them rises; taller chimneys have more height for this to happen so work better. This explains 10' chimneys sticking above single story houses but not really big modern industrial chimneys; it would be much cheaper to use a fan! (Early industrial chimneys were built for this reason before mechanical ventilation was economic.) 2/ Various eddies and back drafts happen around house roofs on windy days. These can blow blasts of smoke back down the chimney into a house. Having the chimney a bit above the surrounding roofs considerably reduces this. This is why chimneys tend to stick at least 3' above the roof even on tall buildings. 3/ Probably the most important reason is pollution. Certainly this is the reason for really big modern industrial chimneys. By releasing the nasty gases that come out of chimneys at great height they will have mixed with a lot of air and should be at "safe" levels by the time they get back to ground level and people breath them in. This doesn't stop pollution of the wider area or planet but it does avoid the problem of extreme air pollution at the outlet point.
They have tall chimneys to compensate for their tiny penises.
It is a matter of common observation that furnaces in various factories are provided with very tall chimneys. Fresh air is drawn through a hole near the bottom end of furnace ,while smoke (being hot ) is driven out through the chimneys If the chimneys is removed flame cannot sustain properly .Moreover ,the temperature of the furnace in that case be lesser .
Many factories produce 'nasty' chemicals as waste products. Tall chimneys 'push' the noxious smoke high into the air - above people's heads etc. The natural wind movement dilutes and dissipates the smoke.
smokestacks
The chimneys or smoke stacks from factories and mills were made very tall to keep the smoke from choking everyone in the nearby area. With a taller chimney the smoke would usually dissipate before it hit the ground.
find out your self stupid homosexual
A steeplejack is a person who climbs tall structures like steeples, chimneys, and towers to perform maintenance and repair work. They are skilled at working at heights and often use specialized equipment to access hard-to-reach areas.
seven tall, gray stone towers called natural chimneys
Not tall enough to be tall, but not short enough to be small.
100feet
12 feet
I'm not sure what you are referring to. Look at the photo in the link given below, this is of Watts Bar 1 which was the last plant commissioned in the US. This plant has two cooling towers, are these what you mean? These towers are simply to cool the condensed feedwater from the turbine condenser, by water/air heat exchange, and any visible vapor coming from such towers is just water vapor, nothing else. Some early reactors such as the Windscale UK air cooled reactors did have tall chimneys (they are called stacks by the plant engineers) to carry the discharge air clear, and they also had filters at the top. These reactors were similar to the Hanford reactors used in the early days in the Manhattan Project, but nobody builds such reactors now. Gas cooled reactors such as the magnox and AGR in the UK have blowdown stacks, these are to blowdown the CO2 coolant on occasions for maintenance. Plants with emergency diesel generators have exhaust stacks for the engine exhausts, you may have seen those. If none of the above answer your query, try to be more descriptive of what you have in mind.