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Before entering fully into the definition of the term phase we will know its etymological origin. In this case, we can point out that it is a word that derives from the Greek, specifically “phasis”, which can be translated as “appearance” or as “manifestation”.

This is what each is called successive state of a draft , a phenomenon, an exercise, etc.

For example: “The construction of the sports center has already entered the final phase”, "In this phase of entrepreneurship we are not so interested in profitability, but we want to position our products", “The Chilean player will not be available for the group stage of the tournament”.

In the same way, we also run into the fact that there are phases in what is the dream process. Specifically, there are basically four: phase I or stage of numbness, phase II or stage of light sleep, phase III or stage of transition and phase IV, which also responds to the name of stage of deep sleep.

In addition, childbirth also has phases:
-Dilation, which is when dilation of the cervix occurs and the head of the fetus begins to descend through what is the birth canal.
-Expulsive, which is when the final stretch of labor begins.
-Accumulation, which takes place when the woman expels outside the placenta.

That without forgetting that there is also the so-called REM phase, which is also known as the paradoxical sleep stage, which comes to last a minimum of 15 minutes and a maximum of 30 minutes and occupies around 25% of the sleep process.

In the context of the electricity , the intensity or value of the electromotive force, at a certain moment, of an alternating current is called a phase. In the case of a multi-phase current, the alternating current is called a phase.

A system of generation, distribution and consumption of electricity that is composed of a single alternating current has, therefore, a single phase: it is a single phase system . He system which is based on two alternating electrical voltages is called biphasic system ; he who appeals to three tensions, three phase .

For the chemistry , the phases are the homogeneous parts which can be physically separated in a system that has one or more components. These are macroscopic sectors with physical properties of homogeneous characteristics.

In the astronomy Finally, the phases are the forms or appearances that the Moon adopts according to the lighting of Sun . The Moon phases they are established according to the apparent modification of the visible part that is illuminated, a change linked to the position with respect to the Sun and to the planet land .

There are nine moon phases: the New Moon , he growing room , the full moon , he waning room and the Black moon They are some of them.

Nor can we ignore that there is a film that bears in its title the word that concerns us. We are referring to "Encounters in the third phase" (1977), which is part of the science fiction genre and was directed by Steven Spielberg.

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