食盐撒在雪上为什么就能把雪融化（Why salt can be melted when it is sprinkled on snow）.docVIP

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食盐撒在雪上为什么就能把雪融化（Why salt can be melted when it is sprinkled on snow）.doc

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食盐撒在雪上为什么就能把雪融化（Why salt can be melted when it is sprinkled on snow） Why can snow melt when the salt is sprinkled on the snow? This is based on the principle that the freezing point drops By adding salt, the saturated vapor pressure of water drops and the freezing point drops The freezing point of salt water is lower than that of water, so after adding salt, it lowers the freezing point, which makes the snow melt easily Some physical and chemical characteristics of the salt (Nacl) used in snowmelt: Soluble salts are easily dissolved in water. This is a very common physical phenomenon The absorption of moisture. The salt surface usually surrounded by a layer of saturated salt solution, when the vapor pressure of the film solution is lower than that of air and water vapor partial pressure, salt absorption of moisture in the air and deliquescence; conversely, when higher than the partial pressure of water vapor in the air becomes dry state. Of course, this is just where salt is exposed to air phenomenon, sealed in the bag with the surrounding air is not isolated from the salt deliquescent; Freezing point is low. The freezing point here refers to the freezing point of the saline solution. The experiment shows that if the salt solution contains 20% salt, its freezing point will be reduced to -16 degrees Celsius In addition, the snow is mainly composed of solid water - small ice crystals, no matter how low the temperature, the ice has sublimation phenomenon, so the snow around the diffusion of water vapor Snow ABC has been hit by widespread snow storms, and we have been able to see a lot of snow melting agents on the road to clear the snow on the roads as soon as possible. It is said that over the past few years, the consumption of snow melting agent up to tens of millions of tons. So what is the snow melting agent? Why does snowmelt cause snow to melt? Will the use of snow melting agents cause harm to the environment and humanity? This paper briefly analysis, for the maj