no its not
no it doesn't
Yes and for longer. Coal is essentially compressed wood.
coke is hotter than coal
No, propane burns at 2500btu while natural gas burns at only 1012btu. Propane burns over 2 times hotter than natural gas.
Basically, it is extremely difficult to get solids to burn. It is even somewhat difficult to get liquids to burn! Gasses burn. Heat turns liquids or solids to gasses and then they burn. In a car engine, fuel injectors turn the gasoline into a fine spray which quickly evaporates into a gas. It then burns. Coal does not burn. A fire heats coal. Then coal gives off gasses. The gasses burn. Then the coal gets hotter. As the coal gets hotter, some of the carbon in the coal turns to gaseous carbon, some of the carbon does not, those flakes of carbon become soot. The carbon gas burns. Some stuff simply is left.
SOME stoves are rated as wood AND coal. Coal burns much hotter than wood. If used in a stove designed for wood ONLY, it will cause the stove to be damaged- parts will warp, break, or melt. Not good.
Because coal is more compact than wood (it is compressed wood plus organic oils essentially) so has more combustible material in a denser form. This reduces the flame fronts accessability to oxygen.
because propane is an even burning gas and is easier to make more or less concentrated
yes... yes it does. it does burn worst but coal will never be good for the environment.
Bituminous coal is soft and burns hotter and longer. Anthracite coal is harder than Bituminous coal and is not preferred for heating.
Coal emits more carbon dioxide pollution than natural gas does.
Cleaner and hotter burn