The Latin word sensible came to our tongue as sensation . The concept is associated with effect wave Print that causes something in a person through the senses . Thermal , meanwhile, is an adjective that mentions what is linked to the temperature or at hot .
The idea of thermal sensation it is used to name how the human being before various environmental conditions. These conditions cause certain sensations in the body that lead the person to "feel" The heat or the cold.
The dry temperature as well as the speed and the air humidity They are factors that affect the thermal sensation. The clothing wearing one person and the foods which consumes, on the other hand, determine the individual thermal sensation.
When a high thermal sensation is recorded, a subject feels very much hot . You can try to lose this heat by minimizing physical activity, protecting yourself from the sun's radiation or exposing yourself to the air that a fan moves.
However, if the thermal sensation is reduced, the person will feel cold . In this situation, it can produce heat through clothing that provides thermal insulation, ingesting caloric foods or doing physical activity.
It is important to highlight that the body appeals to various mechanisms to exchange heat with the environment (that is, to absorb or dissipate heat). The radiation , the convection , the evapotranspiration and the driving They allow the human being to gain or lose heat depending on the case. Let's see below a brief definition of each of these concepts:
* radiation : a heat exchange takes place between two bodies, for which it is necessary that each of them be at a different temperature. An important aspect to note is that bodies should not enter Contact . In the case of the human being, since the most normal thing is that it covers a large part of his body with clothing, this exchange can only occur through those areas that are naked or that have not been overcoated;
* convection : when the air comes into contact with the skin it goes through two very defined changes, which are an increase in volume and another in temperature. East phenomenon it gives rise to a loss of density, which results in it rising and being replaced by air with a greater degree of freshness. When the air temperature is higher than that of the skin, then a process takes place that can be described simply as the inverse of the newly exposed. As in the case of radiation, this exchange mechanism related to thermal sensation affects the less covered or directly naked parts of the body;
* evapotranspiration : on the skin the evaporation if the amount of heat exceeds 2450 kilojoules per kilo of water (this heat comes from the body itself). Two factors that influence this exchange are air velocity and relative humidity;
* driving : If we do not cover the skin or if we wear light clothing, and we come into contact with a body that has a different temperature than ours, a conduction heat exchange takes place. Needless to say, this does not take place as often, as normal in the society Modern is that human beings cover the body with a lot of clothes and the feet with thick footwear. Yes it can happen in privacy, at a time when two people are sleeping together, for example.
Although there are personal issues that define the thermal sensation that each one experiences, the general characteristics of the atmosphere They affect all people. That is why the thermal sensation, expressed in degrees, is usually disseminated as meteorological information in the media.
