It is known as melting point to temperature in which a matter found in solid state happens to his liquid state . For the change of state to occur, said temperature must be constant .
The melting point is a intensive physical property Of the mattery; This means that it is not linked to the amount of substance or body size. In the melting process, the solid matter begins to heat until it reaches the melting point, at which point its change in state and it becomes a liquid.
If the liquid continues to heat, it can reach its Boiling point : from this temperature, a new change of state takes place, this time going from liquid to gas. It should be noted that, while the boiling point is directly related to pressure, the melting point has a poor link with that factor.
When it is a pure substance, the fusion process develops at a single temperature. Thus, the aggregate of hot it will not be reflected in an increase in temperature until the fusion process is finished and the matter has already become a liquid.
Let's see how is the case of Water . The melting point of H2O is 0 degrees . Thus, when the water is at a lower temperature, it is in a solid state. Between the 0 and the 99 degrees , is in a liquid state. Because its boiling point is 100 degrees , from said temperature it enters the gaseous state.
As with many other concepts of science, it is important to point out some of its applications in the real world, since, although they have become part of the theory fundamental, its discovery took place through experimentation and observation. Let's look at the basis of the concept of diffusion process .
In the beginning, the term diffusion gave the idea of mixed car, a process that takes place in the molecules of a fluid because of its thermal movement. Although the molecular diffusion (explained below) is based on this principle, currently it is understood by diffusion also the processes of self-mixing that are not induced by thermal movement, such as those that use agents external to the fluid, which force homogenization thanks to provide energy (this is the basis of the turbulent diffusion ).
The self-mixing process known as molecular diffusion takes advantage of the melting point concept and occurs because of the movement Thermal molecules of a fluid. It is important to note that the word "molecules", in this case, does not always refer to the set of atoms proper, but can also speak of small portions of the fluid in question if, for example, the element to which it is applied is the Water.
In its industrial use, turbulent diffusion offers a much greater effectiveness than molecular, and this can be seen in its values and in the presence of properties that are not found in the latter.
Another of the melting point applications are the following: alloy metals , since this temperature must be reached for handling and molding; manufacture and construction of various products in common use such as windows, bars, safety boxes and warehouses; Determination of the purity of an acid to ensure that its use will not have negative consequences; Identification of unknown substances, by comparing the results with those of the common substances.