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Shape of Raindrops - PowerPoint PPT Presentation


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Shape of Raindrops. Do you think the shape of raindrops like teardrops? Click one of buttons. Yes. No. It is incorrect !. Please click the NEXT button to see the reason. Oh Dear!. NEXT. Do you think the shape of rain likes the tear? Pls click one of buttons.

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Presentation Transcript
slide3

It is incorrect !

Please click the NEXT button to see the reason.

Oh Dear!

NEXT

slide4

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

slide5

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

slide6

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

slide11

Do you think the drops can keep the shape of larger hamburger buns during falling? Please click the correct button.

Yes

No

slide12

Ha! Ha!

Pls click NEXT

button to find out the

truth.

It is incorrect!

NEXT

slide13

Good Job!

Do you know what shape

of larger raindrops change

during falling? Click

the NEXT button to see

the result.

NEXT

slide14

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.

slide15

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