Shape of Raindrops - PowerPoint PPT Presentation

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Shape of Raindrops

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  1. Shape of Raindrops

  2. Do you think the shape of raindrops like teardrops? Click one of buttons Yes No

  3. It is incorrect ! Please click the NEXT button to see the reason. Oh Dear! NEXT

  4. Do you think the shape of rain likes the tear? Pls click one of buttons Pls click the NEXT button to see the real shape of rain drop Congratulations! Answer is correct! NEXT

  5. According to the study by Philipp Lenard in 1898, the small raindrops (< 2 mm diameter) are approximately spherical.

  6. During falling, rain drops take on shapes with flattened bases and rounded tops. Thus, they like falling hamburger buns than teardrops.

  7. When raindrops are falling, they crashes other raindrops.

  8. Hence, the collision causes distortions in the drops' shapes.

  9. Also, it causes drops to merge, and then form a larger drop.

  10. Do you think the drops can keep the shape of larger hamburger buns during falling?

  11. Do you think the drops can keep the shape of larger hamburger buns during falling? Please click the correct button. Yes No

  12. Ha! Ha! Pls click NEXT button to find out the truth. It is incorrect! NEXT

  13. Good Job! Do you know what shape of larger raindrops change during falling? Click the NEXT button to see the result. NEXT

  14. If size of drop is less than 5mm, the drop can keep the shape like hamburger bun. If size of drop is greater than 5mm, the force of air breaks the surface tension of drop. Thus, the drop is broken into the smaller drops like hamburger bun again! Such phenomenon continues until the drop has fallen on the ground.

  15. Web Site For Details Of Shape Of Raindrops • http://www.suite101.com/article.cfm/science_sky/91232 • http://www.ems.psu.edu/~fraser/Bad/BadRain.html • http://weather.about.com/od/cloudsandprecipitation/a/rainburgers.htm • http://en.wikipedia.org/wiki/Rain_drop • http://www.shorstmeyer.com/wxfaqs/float/float.html You can click the above website address to see the details of shape of rain drop, or click END button to finish this lesson. END

  16. End Of Lesson