We can define cold as the total absence of heat or as the presence of low temperatures. In this sense, cold appears as a consequence of heat rather than as an independent phenomenon since it is the result of the lack of those combustions that generate energy on a surface or space and that generate heat. While in the solar system all the planets located behind the Earth are extremely cold, low temperatures also exist (to a lesser extent) on our planet, especially in areas close to the poles of the globe. These are the areas with the least arrival of the sun's rays and that is why they maintain low temperatures compared to the rest of the planet.
Depending on the space, the cold or the feeling of cold can be present in different ways. On our planet we can find low temperatures in many regions, but the perception that everyone has of the cold can be very subjective. In this sense, while in tropical areas the cold is when the temperature is below twenty degrees Celsius, in regions with more hostile climates this can be high temperature. This is why cold is not only a reality (that is, the absence of heat), but also an issue related to the perception of each individual.
In cold spaces, where temperatures are close to zero degrees Celsius or even below them, the different phenomena related to life tend to stop, although they do not die. This is why in extremely cold regions it is difficult to find abundant vegetation, as it is also common to note that dead organisms are better maintained by the freezing conditions of the environment. The adaptation of the human being to cold spaces is undoubtedly a challenge that has been overcome on many occasions but that is not easily resolved in others, especially when intensive climatic phenomena are witnessed or when the development of good living conditions is not possible. .
At the same time, it is important to remember that cold has been recognized by man as one of the most useful elements for preserving food. By recognizing the dormant conditions that food-destroying microorganisms enter, humans have understood that both refrigeration and freezing are some of the most efficient ways to maintain short-lived food products.
