SNOW LAKE
By Mari Brish
It seems sometimes when the first snow flows down, that your body and your soul is like a lake. You feel the world ocean of water. This snow is a part of it. You may think that there is nothing in common. Though, the snow and the lake is the same. The only one thing that may be strange in this case is why the lake can do waves due to the snow and snow can not do such a thing due to anything. I find this thing very strange. It’ s not a question of physics, but it’ s a question of soul.
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It seems sometimes when the first snow flows down, that your body and your soul is like a lake. You feel the world ocean of water. This snow is a part of it. You may think that there is nothing in common. Though, the snow and the lake is the same. The only one thing that may be strange in this case is why the lake can do waves due to the snow and snow can not do such a thing due to anything. I find this thing very strange. It’ s not a question of physics, but it’ s a question of soul.
Snow is a type of precipitation in the form of crystalline water ice, consisting of a multitude of snowflakes that fall from clouds. The process of precipitation is called snowfall. Since snow is composed of small ice particles, it is a granular material. It has an open and therefore soft structure, unless packed by external pressure.
Snow crystals form when tiny supercooled cloud droplets freeze. These droplets are able to remain liquid at temperatures colder than 0째C because in order to freeze, a few molecules in the liquid droplet need to get together by chance to form an arrangement close to that in an ice lattice; then the droplet freezes around this 'nucleus'. Experiments show that this 'homogeneous' nucleation of cloud droplets only occurs at temperatures colder than -35째C. In warmer clouds an aerosol particle or 'ice nucleus' must be present in the droplet to act as a nucleus. Our understanding of what particles make efficient ice nuclei is poor what we do know is they are very rare compared to that cloud condensation nuclei which liquid droplets form on. Clays, desert dust and biological particles may be effective, although to what extent is unclear. Artificial nuclei include silver iodide and dry ice, and these form the basis of cloud seeding.
Ice crystals formed in the appropriate conditions can often be thin and flat. These planar crystals may be simple hexagons, or if the supersaturation is high enough, develop branches and dendritic (fern-like) features and have six approximately identical arms, as per the iconic 'snowflake' popularized by Wilson Bentley. The 6-fold symmetry arises from the hexagonal crystal structure of ordinary ice, the branch formation is produced by unstable growth, with deposition occurring preferentially near the tips of branches.
The shape of the snowflake is determined broadly by the temperature, and humidity at which it forms. Rarely, at a temperature of around 28 °F, snowflakes can form in threefold symmetry — triangular snowflakes. The most common snow particles are visibly irregular, although near-perfect snowflakes may be more common in pictures because they are more visually appealing.
Snow remains on the ground until it melts or sublimes. In colder climates this results in snow lying on the ground all winter. When the snow does not all melt in the summer it becomes a glacier. The water equivalent of the snow is the thickness of a layer of water having the same content. For example, if the snow covering a given area has a water equivalent of 50 centimeters (20 in), then it will melt into a pool of water 50 centimeters (20 in) deep covering the same area. This is a much more useful measurement to hydrologists than snow depth, as the density of cool freshly fallen snow widely varies. New snow commonly has a density of between 5% and 15% of water. Snow that falls in maritime climates is usually denser than snow that falls in mid-continent locations because of the higher average clouds over oceans than over land masses. Cloud temperatures and physical processes in the cloud affect the shape of individual snow crystals. Highly branched or dendritic crystals tend to have more space between the arms of ice that form the snow flake and this snow will therefore have a lower density, often referred to as "dry" snow. Conditions that create columnar or plate like crystals will have much less air space within the crystal and will therefore be denser and feel "wetter".
SNOW LAKE
Mari Brish, 2008