1. Printable Version
2. Download PDF
3. Cite this Page

Can two snowflakes be alike?

No two snowflakes are identical, molecule for molecule. (Molecules are particles made by the combination of two or more atoms.) A snowflake is made up of more than 180 billion water molecules that come together under a variety of conditions. Furthermore, molecules are constantly freezing to and evaporating from snowflakes, meaning that snowflakes, at the molecular level, are constantly changing.

However, it does appear that two snowflakes can be identical in size. This was proven in 1989 by Nancy Knight, a cloud physicist (a scientist specializing in the interaction between matter and energy) with the National Center for Atmospheric Research. Knight collected snow samples from an airplane over Wasau, Wisconsin, and found two snowflakes that were both 250 microns long and 170 microns wide. (A micron is one-millionth of a meter.)

Sources: Engelbert, Phillis. The Complete...

Join eNotes

The above is a free excerpt. Get total access to this content with the:

eNotes Pass

1. Atmospheric Basics
   1. What is barometric pressure and what does it mean?
   2. What are the highest and lowest recordea temperatures on Earth?
   3. What is the Coriolis effect?
   4. Why are the horse latitudes called by that name?
   5. What are jet streams and when were they discovered?
   6. What is the dew point and how does dew form?
   7. When does frost form?
   8. What is the heat index?
   9. How much humidity should be maintained in the house during winter?
   10. What is meant by the windchill factor?
   11. When and by whom were clouds first classified?
   12. What are the four major cloud categories, based on height in the sky?
   13. What is the Beaufort Scale?
   14. Is Chicago the windiest city?
   15. What is a chinook?
2. Precipitation And Thunderstorms
   1. How does snow form?
   2. How much water is there in an inch of snow?
   3. Is it ever too cold to snow?
   4. Can two snowflakes be alike?
   5. What is the difference between freezing rain and sleet?
   6. When and where do thunderstorms occur in the United States?
   7. Where is the rainiest place on Earth?
   8. How hot is lightning?
   9. How is the distance between lightning and an observer calculated?
   10. What is ball lightning?
   11. What color is lightning?
   12. How large can hailstones become?
   13. How many volts are in lightning?
3. Tornadoes And Hurricanes
   1. Which month is the most dangerous for tornadoes in the United States?
   2. What is the Fujita and Pearson Tornado Scale?
   3. How are hurricanes classified?
   4. Which U.S. hurricanes have caused the most deaths?
   5. What were the deadliest and costliest natural disasters in United States history?
   6. How do hurricanes get their names?
4. Optical Effects
   1. What is the order of colors in a rainbow?
   2. What is a halo?
   3. What are sundogs and moon dogs?
   4. When does the green flash phenomenon occur?
   5. What is Saint Elmo's fire?
   6. How does an airplane produce a glory?
5. Forecasting And Climate
   1. When did the first television and radio weather forecasts take place?
   2. How accurate are forecasts?
   3. What is nowcasting?
   4. What is a radiosonde?
   5. Can groundhogs accurately predict the weather?
   6. Is the world actually getting warmer?