He hot it is what a living being feels before a High temperature . Physics understands heat as the energy that is transferred from one system to another or from one body to another, a transfer linked to the movement of molecules , atoms and other particles.
In this sense, heat can be generated from a chemical reaction (like combustion), a nuclear reaction (like those that develop within the Sun ) or one dissipation (either mechanical, friction, or electromagnetic, microwave).
It is important to keep in mind that bodies are not hot, but internal energy . When a part of this energy is transferred from a system or body towards another that is at a different temperature, one speaks of heat. Heat transfer will occur until the two systems are at the same temperature and the so-called thermal equilibrium .
The amount of thermal energy that is transferred is calculated and expressed in calories . This unit of measurement (unofficial) reflects the amount of energy required to raise the temperature of one gram of H2O (water) from 14.5º to 15.5º Celsius. At International System of Units , the unit of energy is known as joule . A calorie is equivalent to 4,184 joules.
There are other uses of the term heat, usually related to a symbolic sense. Heat can therefore be synonymous with lightning and exaltation (for example, “The warmth of the public was felt in the stadium”) or refer to the most intense of an action ("His clothes broke in the heat of battle").
Certain consequences of global warming
Without doubt, the clearest consequence of global warming is the increase in the average temperature of the planet, a phenomenon that we have witnessed in recent decades. Likewise, the sea level has increased considerably, which threatens dangerous floods.
All this could have an impact on the Health, causing an increase in the average number of people affected by respiratory and cardiovascular diseases, as well as infections caused by tropical insects and dehydration. The first group of conditions mentioned would take place because, because of the heat, the effort needed to perform any activity would increase physical , with the consequent pressure on the lungs and the circulatory system.
With respect to mosquitoes and the rest of the pests, being that the tropics would expand, diseases such as dengue, yellow fever, cholera and malaria would affect a larger percentage of the world's population.
The magnitude and frequency of rainfall would be greater, although the water level of rivers and lakes would decrease, given the greater evaporation caused by high temperatures. Certain droughts throughout the year could affect the productivity of the generation of Energy electric On the other hand, naturally, the demand for drinking water would increase, to fight the heat. This demand, however, could not be satisfied.
Another possible consequence of excessive evaporation would be that the soils lost their moisture; this would cause many vegetation-rich areas to become deserts . The loss of plants and nutrients would logically follow a decrease in livestock activities, with their impact on the economy.
Floods, on the other hand, would not only bring massive evacuations, but seawater would salinize certain rivers and cause an increase in the erosion of coastal buildings, which would threaten their foundations. In turn, sunlight would not reach the bottom of the reefs with equal ease, and this would directly affect the process of photosynthesis of certain species that are essential for coral life, one of whose functions is to moderate waves.