ความคิดเห็นที่ 1
There are many reasons that no two snowflakes are alike. Factors that influence the size and shape of a snowflake are:
Snowflakes form by sticking to each other while falling and blowing through the wind
* Air currents (which direction the air is moving)
* Humidity levels (the amount of water vapor in the air)
* How long it takes the crystal to fall
* Wind speed
* Amount of dust, salt or other solid particles in the air
* Pressure from the weight of other snow crystals
* Combining shapes with other snow crystals
* Changes to any of these factors
http://www.papersnowflakes.com/science.htm
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