Looking At Snow Upclose
Snow is a product of winter weather that many people have observed and experienced. The idea of snow conjures up images of fluffy flakes that cover the ground in a white blanket. The snowflakes that are seen falling from the sky are actually a composition of many particles of snow crystals: the base form of a snowflake.
Many people have images of what they call a snowflake, having seen pictures taken of snow at the microscopic level. What are actually being seen are snow crystals: tiny drops of water that have frozen because of cold air in the atmosphere. These crystals begin to grow within a cloud and fall to the earth as precipitation. As each snow crystal falls, if the temperature remains below the freezing mark (32 degrees Fahrenheit), they will retain their shape and join with other crystals to form snowflakes. Depending on the temperature, snowflakes can have various appearances. The fluffy snow that is sometimes seen will fall at temperatures that are close to the freezing mark. As the temperature drops, snowflakes become denser and change their shape. Snow will remain on the ground and accumulate as long as the temperature stays below freezing.
Snow has been studied extensively as part of precipitation, and the use of electron microscopy has allowed scientists to view extremely small particles of snow and study it to determine its composition. Scientists can then apply the facts they have learned about snow to everyday use for assisting with traffic, city structures, travel, and many other practical areas that may deal with the disruption of snow. There are many interesting images available to view the microscopic size of snow crystals and the details of each particle.
For more information about snow crystals and their structures, please visit the following sites:
- Weather: Ice and Snow: An explanation of the formation of snow before it falls to earth.
- How Do Snowflakes Form?: A brief account of the formation of snow particles.
- Let it Snow: An introduction to the formation of snow, as well as a brief list of types of ice crystals.
- Weather on the Planets: How snow is generated: the formation of crystals and snowflakes.
- Snow Crystal Photography: Explanations and some very good pictures of snow crystals at close range.
- Snow Crystals, Our Friends: The patterns of snow crystals and the formation of snowflakes.
- Snow: The conditions required for snowfall.
- Blizzards and Winter Weather: The formation of snowflakes and other icy precipitation.
- Everyday Mysteries: Answering the question if no two snowflakes are alike.
- National Snow and Ice Data Center: Frequently asked questions about snow precipitation.
- Snow: An Aggregate of Ice Crystals: Atmospheric conditions that occur to produce snow.
- The Science of Snowflakes: A weather correlation chart between temperature and type of snow crystal.
- Snowflakes: Many images of microscopic snow crystals captured by Rochester Institute of Technology students.
- Snowflakes Up Close: An example experiment to try and view snowflakes and their different structures.
- Bentley Snow Crystal Collection: An exhibit at the Buffalo Museum of Science from the work of Wilson Bentley.
- Snowflake Movies: A site with time-lapsed images of growing snowflakes.
- Smithsonian Institute: Snowflakes and their basic shapes.
- Snow Wonderland: A background about snow and several fun facts.
- Snow Formation: Definitions of snow and the conditions required for it to occur.
- Symmetry of Snowflakes: Several good images of snowflakes up close, with a brief explanation following.
- Winter’s Secret Beauty: Photographs of snow and a news story from National Geographic.
- Microscopic Snowflakes: Information about snowflakes and the practice of examining them under a microscope.
- How to Preserve a Snowflake: A small scientific method for protecting a snowflake to study it.
- The Snowflake Man: A page dedicated to Wilson Bentley, a scientist who studied multitudes of snowflakes in his career.
- Snowflakes: (PDF Document) A detailed presentation discussing ice structure, aggregation of crystals, and the history of snowflake study.

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