By Ronan 
In the earlier days, whoever practiced the process of producing the metal and then using the powder milling process to crush it down into smaller metal granules were looked upon like fools. Like, people assumed that that producing the raw material and then grinding it into smaller particles using the powder milling process is a waste of time and money. But, as the years passed on, the people who spoke that way understood the intensity of the process and when they started appreciating the process from then onwards. Here are few of the reasons that have acted as the major eye- openers for the people who did not understand the use of the process and spoke in a negative manner:
- Handling the metal:
The metal as a huge block or huge chunk cannot be that easily handled when compared to the smaller granules of the metal. For example, if structures are to be made out of the metals, then the deformation of the metal and then reformation has be considered and in this process the metal will be wasted a lot. Instead of all this, if the metal itself is made into the smaller granules kind of thing, then all that you have to do is consider the right amount of metal and then form the structure. The process is easier, less time consuming and on top of all this, there will be no wastage of the metal, at least not as much in the former case. Hence, it is considered that the metal be made into finer granules rather than keeping it is a huge mass of metal. - Heating the metal:
Heating the metal is a common process and it is required on the daily basis. To cast the metal into different shapes and sized, the metal has to be melted and it has to be in its molten state. Then the metal will be poured into the empty cavities and the structure will be formed. According to the scientific base and calculations, it can definitely be inferred that the smaller metal particles have the larger surface area and the heat distribution in this case is uniform throughout.
If the metal is a huge chunk of mass, then the heat is not properly distributed all over the mass and as a result of this, there will be uneven heating and might lead to the change in the molecular structure of the metal.
Moreover, you will require a large amount of heat to finish the complete heating of the metal and bring the entire metal to the molten state as such.
These are few of the main and important reasons why the metal has to be made into granules.