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From Latin gravĭtas, the gravity is a physical strength that land exerts on all bodies towards its center. It is also about the force of attraction of bodies because of their dough .

Gravity is linked to weight , which is the force of gravity that the planet's mass exerts on all the objects that are within its gravity field. The weight of the same body can vary on different planets if their mass is different from the mass of the Earth.

The English physicist, mathematician, philosopher and inventor Sir Isaac Newton it was he who proposed the universal gravitation law or gravity theory . Newton said that every object that has mass exerts a gravitational attraction on any other object with mass, beyond the distance between them. The greater the mass, the greater the force of attraction; on the other hand, the closer the objects are, the greater the force of attraction.

However, we must not forget the fact that throughout history there have been other scientists and researchers who have also left their mark on the term of gravity. This would be the case, for example, of the German physicist Albert Einstein who is known precisely for his theory of general relativity.

In 1915, it was when he presented this theory to the scientific community that we could basically say that it is a reformulation of the term gravity. Specifically with that what he did was to establish that gravity, rather than a force of attraction, is a sign of the distortion of what spacetime geometry is. A distortion that is clearly influenced by the set of objects that are part of it.

In another sense, the notion of gravity is related to the composure and the circumspection . For example: "Solemn, the government spokesman gravely announced the death of the prime minister", “I don't like dinners where everyone acts with gravity and without spontaneity”.

The term also refers to the greatness , importance or enormity of any question: "The severity of the epidemic was manifested with the death of twenty people in the metropolitan area of ​​the city", "The policeman was seriously injured after receiving four bullet impacts on his body".

In the latter case we have to say that there are several specific types of severity. In this way, in the field of Medicine, we can establish that the following levels exist:

Mild. In this case the symptoms that the patient has produce a minimal alteration in what is his work or social activity.

Moderate The symptoms of the person in question are halfway between mild and severe.

Serious. The disease or pathology suffered by someone damages significantly what are the above mentioned activities.

Partial remission. With this term, what comes to express itself is that of the symptoms that the patient had, he only maintains some.

Total referral In this case, the patient has seen how all the symptoms of his disorder have disappeared but that does not prevent it from being necessary to continue having reviews to keep him under control.

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