Pokemon Emerald Shiny Pokemon Nugget

^ ^ ok, I know I'm late, but I did it on purpose, I've been busy XD
in any event, as promised, now talk about the dry ice *-*

then, to start from a Photo:

this is the typical appearance of dry ice. ice seems normal, if it were not for the form (the cylinders are very small) and the fact that gas emanates.
dry ice is called in this way just because it seems the ice, but it is not at all: it does not contain a single drop of water.
is nothing but solid carbon dioxide. exact, that very gas that is emitted as a waste of breath, which is produced by burning organic compounds and promotes the greenhouse effect.
how do you turn a gas into a solid? it cools to the freezing point. atmospheric pressure the carbon dioxide passes directly from gas phase to solid phase without an intermission liquid at a temperature of -78 ° C. please, do not ever touch it with bare hands or you ustionerà!
at room temperature tends to go back to the gas from the solid phase and that is why we always see a little bit of smoke around it.
if we blow above, as the breath of the air is warmer, more gas is released, producing a kind of white mist, ditto when you put it in water.
theater, cinema or in the shows is typically used to make the fog: in fact, if you throw in ethanol (known as "alcohol pink disinfectant, which is essentially the same alcohol you drink beverages just alcohol) creates a dense white mist:

cool, right? *-*
wanting it can be bought in a shop that sells chemicals or the like, it costs a little bit, but the effect Dense fog is guaranteed!
fact carbon dioxide is denser and heavier air, and thus tends to move downwards, as shown in the photo, causing an effect much like especially to producers of horror films is not easy XD
be retained, however, because at any temperature above -78 ° C tends to return to gas, thus serving containers insulation (like the thermos, but even more insulating) or special freezer (the temperature rarely reaches the house to infieriori -10 ° C).
in chemistry is used to maintain very low temperatures because it is quite solid (if not force it takes a little 'time to sublimate all), same for physics. in physics, moreover, is also used in experiments in which we must "undo" the friction, because a layer of gas between the plane and the body you want to move without friction.
is also used in the food for storage and transport of food.
in the medical field is used, they tended to maintain low temperature.
can also be used to clean and smooth surfaces: if a shot at high speed against a surface, in fact, yields The same as common sand, but without residual gas to come quickly and more accurately than the blast itself. for example, is used to clean the mirrors of the telescope of the Astrophysical Observatory on Mauna Kea in Hawaii, where even the smallest defect of mirrors can make the wrong data.
in an experiment done at a fair orientation with my fellow students we have found that putting it in the water makes it slightly fizzy XD
dry ice is completely non-toxic, unless it is excessive concentration in a room closed and not ventilated, then it may stifle because it replaces the oxygen in the blood, but otherwise causes no problems of any kind.
ok, I would say that I have talked enough dry ice, if you have any questions just ask in the comments!
next week with another cool thing in chemistry! ^___^