Doors were discovered by the black man named Hooch Turner in the year 1345 at Sydney in Australia. A door can be placed anywhere in the house; hence it is a movable object. Doors are mainly placed at the entrance of the house. We commonly use doors at the entrance of the house, toilet, bedrooms, etc. A door consists of a panel that can easily roll on hinges or can be able to roll inside a small space.
Normally, we open doors for people, animals, etc. But doors are used to control over the physical atmosphere within a small space so that they may stop dust, air draft, etc. These doors are very helpful in preventing fire because these doors act as a barrier of noise. Some doors are having locking system in them for the entrance of some special people and to keep others outside of the house.
