slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
* Radius of a sphere with the same mass PowerPoint Presentation
Download Presentation
* Radius of a sphere with the same mass

Loading in 2 Seconds...

play fullscreen
1 / 5

* Radius of a sphere with the same mass - PowerPoint PPT Presentation


  • 334 Views
  • Uploaded on

The Shape of Raindrops The common perception that raindrops are teardrop-shaped is wrong. (Breaks up into smaller drops). <1mm*. 2mm*. 3mm*. Move the mouse pointer over each raindrop shape to see more details. >4.5mm*. References. * Radius of a sphere with the same mass.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about '* Radius of a sphere with the same mass' - Audrey


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

The Shape of Raindrops

The common perception that raindrops are teardrop-shaped is wrong.

(Breaks up into smaller drops)

<1mm*

2mm*

3mm*

Move the mouse pointer over

each raindrop shape to see

more details

>4.5mm*

References

* Radius of a sphere with the same mass

slide2

The Shape of Raindrops

The common perception that raindrops are teardrop-shaped is wrong.

<1mm*

In a small raindrop, the surface tension of water molecules is strong enough to pull the drop to form a sphere

2mm*

3mm*

>4.5mm*

References

* Radius of a sphere with the same mass

slide3

The Shape of Raindrops

The common perception that raindrops are teardrop-shaped is wrong.

LOW

PRESSURE

LOW

PRESSURE

<1mm*

HIGH

PRESSURE

Air flow

HIGH

PRESSURE

2mm*

Air flow

3mm*

  • The larger the raindrop, the weaker the surface tension.
  • As a larger raindrop falls faster, air pressure will build up at the bottom of the drop so that the bottom of the drop will be flattened, or even develop a depression.
  • The pressure just above the drop (or called “wake”) is relatively lower so that the top portion of the drop is being “sucked” upwards.

>4.5mm*

References

* Radius of a sphere with the same mass

slide4

The Shape of Raindrops

The common perception that raindrops are teardrop-shaped is wrong.

(Breaks up into smaller drops)

<1mm*

2mm*

3mm*

>4.5mm*

  • When a drop is very large, the surface tension is completely overwhelmed and it can be blown inside out to form “a bag with an annular ring of water and then break up into smaller drops” (Fraser).

References

* Radius of a sphere with the same mass

references
References
  • Cramer, M.S. (2004). The Shape of Raindrops. Retrieved from http://www.fluidmech.net/ tutorials/raindrops/raindrop.htm
  • Fraser, A.B. (n.d.). Bad Rain. Retrieved from http://www.ems.psu.edu/~fraser/Bad/BadRain.html
  • Heidorn, K.C. (July 1, 2000). Weather Almanac for July 2000 - Raindrops, So Many Raindrops. Retrieved from http://www.islandnet.com/~see/weather/almanac/arc2000/alm00jul.htm
  • U.S. Geological Survey (September 14, 2005). Are raindrops shaped like teardrops? Retrieved from http://ga.water.usgs.gov/edu/raindropshape.html