Have arisen since the first huts and ski resorts, was born a very wealthy business fed by the winter holidays , which lead many people to spend on the ski runs the holiday season. Given the demand increasingly high, it was necessary to resort to expedients artificial to ensure the correct amount of snow even when conditions weather not favor it. So the plants were designed for artificial snow, which provide full coverage for all the snowy slopes of a ski lift. The use of this technology has been much debate for several reasons ecology. But in the meantime let’s see how an artificial snow system.

artificial-snow

There are two types of systems: the spears and guns snow . In the first case it is aluminum tubes, up to 12 meters long, placed vertically in places less exposed to the wind; on top of these tubes there is a nozzle for air and one for water; the cannon is instead shorter and wider and its interior is arranged a large propeller. These are used on wheels or skids so that they can be moved. What better teacher to figure out how to produce snow crystals if not the very nature? These artificial implants mimic the natural process by which form the snow. The cannons sprayed and pump the liquid water that feeds them; the latter, once reduced in tiny droplets, freezes instantly as soon as it comes in contact with air (the proper temperature in this process is around -7 ° C, -6 ° C), giving rise to crystals of ice. So, the combination of compressed air and water, at a certain temperature, gives rise to the nuclei of which will be born by freezing the snow crystals. The nuclei are obtained once again added with water, this will settle around each core giving life to the crystal itself, which, weighted, will be attracted to the ground thanks to the force of gravity.

Particles resulting from this process, however, are different than the natural ones: they are more spherical, more compact and have all the same size; from this we infer that the characteristics of artificial snow are different from the natural one. In nature, the crystals are formed more slowly and not in a homogeneous way: those that arise at lower temperatures are smaller than those that are formed at higher temperatures, for these reasons, the natural snow does not present the same density of typical ‘ artificial . With modern technology, you can have full control over the diameter of the nozzles inside the gun in such a way to make production efficiency close to 100%, while in the past, to get close to these results, it was used a particular protein obtained from the controlled fermentation of the bacterium Pseudomonas syringae; Needless to say, it is a method obsolete.