According to the context in which the word is used substance, it may refer different questions.
Essence of things that is not modified
The first that we will mention is the one that maintains that substance is the same to say essence, that is, it is that which remains of a being beyond the states in which it is found, the changes it experiences. For example, when we say that someone underwent a substantial change in their behavior, it is because we no longer recognize them for what they used to do.
Use in Philosophy
At the behest of the Philosophy the term will apply to all that which is in itself and not in another.
Meanwhile, the substance turned out to be a fundamental part of the philosopher's work. Aristotle, who in the third part of his work deals with the concept and calls it metaphysics or first substance, because Aristotle calls substance privileged way of being, therefore, what is not essential will be called accident. After Aristotle, the concept continued to be approached by philosophy of course, for example, Discards He argued that the substance is what it is in itself, that it is conceived by itself and that it does not need anything else to be and a little later, Spinoza, identified her with God.
Nutritional elements of food
On the other hand, the term is used with much recurrence to refer to the nutritional elements of food.
In order to enjoy good health, human beings must consume a balanced diet that implies ingesting various nutrients, substances that will precisely help us in this regard.
Among the most relevant nutritional substances we can mention the following: carbohydrates (energy sources), fats (provide energy and regulate body functions), proteins (essential for the conformation, repair and growth of connective tissues and also make their energy contribution) , fiber (organic regulation), vitamins (regulate body functions), minerals (essential for the proper functioning of certain organic processes) and water (eliminates toxins and allows nutrients to be assimilated).
Toxic substances: harmful to the body
We must emphasize that when a substance turns out to be harmful to our body, it is called a toxic substance.
Toxic substances are any type of product that is capable of causing harm to a person's health.
Or because it is used incorrectly, because it is used by a person who should not, or because it is ingested in an inappropriate amount.
There are toxic substances that when they come into contact with the eyes and skin can cause damage, while there are others that generate it when inhaled or ingested.
We can distinguish four types of toxic substances: medical tablets or pills, household cleaners and gases such as carbon monoxide.
A common cause of death in people is the inhalation of carbon monoxide. This tends to happen a lot during the winter when gas stoves are turned on and the home does not have the corresponding ventilation.
Product labels should always be checked, especially those used for cleaning, to handle them correctly and not suffer any damage.
When it is known or suspected that someone ingested a toxic substance, they should be taken immediately to the doctor for assistance and thus reduce the possibility of serious health consequences.
Use in chemistry
In the field of Chemistry substance will be called homogeneous system that presents a single component such as water. In the event that the substance cannot be decomposed into others by physical processes, it is called pure substance , and in those cases that it can, it will be called compound substance, meanwhile, the combination of pure substances is known as mixtures, being possible in these their separation by physical and mechanical procedures.
Prominent part of something
Another common use of the word is to refer to that most prominent part of a thing or question, that is, the one in which all interest resides. "The substance of the story is precisely what you have not read yet.”
Drugs
On the other hand, it is common for the concept of substance to be used to refer to drug use by some people.
"The toxicological tests carried out after the crash confirmed that he had ingested illegal substances."
Use in anatomy
And in Anatomy the white matter is one that is formed by the union of nerve fibers and the gray matter It involves those areas of the central nervous system, just greyish in color, made up of neuronal bodies and dendrites devoid of myelin.
