Starting from the water vapor that gathered at the Earth's atmosphere, collection of water vapor cools to the point of condensation (is the temperature at which the gas turns into liquid or solid form), then agglomerate to form clouds. At the beginning of the formation of clouds, its mass is much smaller than the mass of air so that the clouds are floating in the air? just like the wooden beams that floats on the surface of the water. However, after the vapor collection continues to grow and merge into the cloud, its mass also increases, so that at one time the air could no longer hold. The clouds broke and the water particles fall harmlessly to Earth.
The particles of water that falls it is pure water (not contaminated by other particles). Pure water does not immediately freeze at 0 degrees Celsius, because at that temperature changes from liquid to solid phase. To make the required freezing temperature of pure water is lower than 0 degrees Celsius. This also happens when we put the kettle, the water evaporates when the temperature is above 100 degrees Celsius for at 100 degrees Celsius is the phase change from liquid to vapor. To accelerate the phase change of a substance, usually added special substances, such as salt is used to accelerate the melting of ice into the water phase.
Usually the air temperature just below the cloud is below 0 degrees Celsius (the temperature depends on the altitude above sea level). However, low temperature alone is not enough to create snow. When the particles of pure water is in contact with air, then pure water was contaminated by other particles. There are certain particles that serve to accelerate the freezing phase, so that pure water quickly into ice crystals.
Impurity particles are involved in this process is called nukleator, in addition to functioning as a promoter of freezing phase, also adhesive antaruap water. So that the particles of water (which is not pure anymore) joined together with other water particles to form larger crystals.
The particles of water that falls it is pure water (not contaminated by other particles). Pure water does not immediately freeze at 0 degrees Celsius, because at that temperature changes from liquid to solid phase. To make the required freezing temperature of pure water is lower than 0 degrees Celsius. This also happens when we put the kettle, the water evaporates when the temperature is above 100 degrees Celsius for at 100 degrees Celsius is the phase change from liquid to vapor. To accelerate the phase change of a substance, usually added special substances, such as salt is used to accelerate the melting of ice into the water phase.
Usually the air temperature just below the cloud is below 0 degrees Celsius (the temperature depends on the altitude above sea level). However, low temperature alone is not enough to create snow. When the particles of pure water is in contact with air, then pure water was contaminated by other particles. There are certain particles that serve to accelerate the freezing phase, so that pure water quickly into ice crystals.
Impurity particles are involved in this process is called nukleator, in addition to functioning as a promoter of freezing phase, also adhesive antaruap water. So that the particles of water (which is not pure anymore) joined together with other water particles to form larger crystals.
If the air temperature not to melt the ice crystals, ice crystals falling to the ground. And this snow!
source :
source :
http://www.ehow.com/how-does_4563981_snow-form.html
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