Question

is there any difference between wood and coal in terms of physical state ​

Answer 1

Answer:

yes,on burning wood, it produces less heat because it's calorific value is much less than that of coal.whereas, coal is referred to as a clean fuel as well as known as it's high calorific value. it don't emit any smoke and any solid residue after burning.

the another difference can be that wood burns with a flame whereas coal just glows it don't produce flame.