Question

People usually keep angethi/burning coal in their closed rooms during winter season. Why is it advised to keep the door open?

Answer 1

When coal burns in air, it produces carbon dioxide, which is non-poisonous. But, when an angethi or coal burns in a closed room, the air or oxygen cannot enter the room.

So, in the incomplete supply of oxygen, coal burns to produce carbon monoxide, which is a highly poisonous gas. It causes suffocation in a closed room. So, doors and windows should be open.