What is Threshold:
The threshold is the entrance, the beginning, the beginning or the first step of any thing or process. The term threshold derives from the word thresholdand this in turn from the Latin term liminariswhich means startl or what comes first.
He pain threshold is the minimum intensity of a stimulus that awakens the sensation of pain.
In psychophysiology, the threshold is the minimum sensitivity level of a sense (touch, smell, vision or hearing). It is also the minimum quantity or value of a stimulus or phenomenon from which the sensation appears, changes or disappears. A transmission of a nervous impulse originates and the effects of a physical agent become perceptible.
In architecture, the threshold is the lower part or a step of the opening of a door of a house and the part opposite to its lintel. It is also the beam crossed at the top of an opening to support the wall above.
In aeronautics, the threshold is the beginning of the part of the runway that is usable for landing.
For example, the sound or hearing threshold, which is the minimum intensity or frequency that a sound must have to be perceived by the human ear. The light threshold, on the other hand, is the minimum amount of light that the human eye can detect in the dark.
The threshold is the minimum amount of signal of a magnitude necessary to be registered by a system.
In many areas of knowledge there are thresholds, for example:
In bathymetry there is the underwater threshold, which is the point closest to the surface in the deepest path on the seabed that allows the current to pass from one ocean basin to another.
In photography, there is the photography threshold, which determines which pixels will be black and which will be white in digitizing line work.
There is also the poverty line, which is the minimum income level necessary to obtain an adequate standard of living in a given country.
The profitability threshold, which is the minimum business volume from which a product or company becomes profitable, among others.
See also: