The concept of stairs comes from the Latin word scalaria, in turn derived from scalāre. A ladder is a structure formed by steps what link two sites located at different heights.
The stairs, therefore, serve to down and up, allowing access to places that are at different levels. Sometimes, in addition to the steps (or steps), present plateaus or breaks Y railings (railings).
There are multiple types of stairs. The fixed stairs are those that are part of the structure of a building and that they cannot move. Between these stairs we can find the spiral stairs, the back and forth stairs and the one-flight stairs, among many others.
Multi-story or storey buildings always have stairs, even when they have elevators. Ladders are essential to go up and down in an emergency or when a power outage occurs. electric power that prevents the operation of the elevators.
The portable laddersMeanwhile, they can move according to need. In most of the houses there are stairs of this kind so that the inhabitants can reach items that are stored in tall furniture, change lamps or paint the furniture. roofs, to mention a few possibilities.
A mechanical stairOn the other hand, it is a means of transport with steps that move down or up automatically. The Username You just have to stand on one of the steps and let the escalator take you to a higher or lower level as appropriate.