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1. coal is a natural substance tat have substantial energy
where as petroleum do have but its not directly fr nature we do thermal process to extract it fr the natural sources
2 lpg is used in households and its litlle bit polluting
cng is used in creams,vehicles and its less polluting
3. combustible : these are the substances tat can be burned under normal condition like burning wood etc
non - combustible : these are the substance
which is not easy to burn them like metal compound have high melting pts
where as petroleum do have but its not directly fr nature we do thermal process to extract it fr the natural sources
2 lpg is used in households and its litlle bit polluting
cng is used in creams,vehicles and its less polluting
3. combustible : these are the substances tat can be burned under normal condition like burning wood etc
non - combustible : these are the substance
which is not easy to burn them like metal compound have high melting pts
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