Question

what what name is given to the process of heating a substance in the absence of air​

Answer 1

Answer:

The strong heating of coal in the absence of air is called destructive distillation of coal. If coal is heated in the presence of air,then coal burns to produce mainly carbon dioxide gas and no other useful products were obtained

Explanation:

Answer 2

Answer: When coal is heated strongly in the absence of air in closed retorts very useful products are obtained. The strong heating of coal in the absence of air is called destructive distillation of coal.