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Author Topic: How fast does your average rain drop...drop?  (Read 25739 times)

Offline neilep

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How fast does your average rain drop...drop?
« on: 22/03/2005 12:09:46 »
Hello, How are you today ?...I'm fine.

Good !!! that's the small talk over !!..what I simply must know today is how fast does the average rain drop drop ?.....I would guestimate between 5 and 10 mph ?....how do they measure this ? is it some kind of pressure mat on impact or do they measure it over distance fallen ?

I just want to know so that I can make my children think I'm clever:D

Thanks

<font color="blue">Men are the same as women.... just inside out !!</font id="blue">
« Last Edit: 30/06/2014 10:45:38 by graihagh »


 

Offline DrPhil

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Re: How fast does your average rain drop...drop !!
« Reply #1 on: 23/03/2005 00:24:26 »
http://www.wonderquest.com/falling-raindrops.htm
http://ggweather.com/archive/weacornerdec02.htm
http://www.madsci.org/posts/archives/may2001/990640427.Es.r.html
The terminal velocity of a falling raindrop through still air depends on its size. An average raindrop is about 2 millimeters in diameter and has a maximum fall rate of about 14.5 miles per hour or 21 feet per second. A large raindrop, 5 mm in diameter, falls at 20 mph (29 feet/second), but drops of this size tend to fall apart into smaller drops. Drizzle, which has a diameter of 0.5 mm, has a fall rate of 4.5 mph (7 feet/second).
 

Offline neilep

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Re: How fast does your average rain drop...drop !!
« Reply #2 on: 23/03/2005 08:30:55 »
Thank you Phil,

With such a preponderance of info on the web I might need never ask a question here again *sigh*......Thanks you for the excellent links....it's really appreciated.



Men are the same as women.... just inside out !!
 

Offline chris

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Re: How fast does your average rain drop...drop !!
« Reply #3 on: 23/03/2005 08:40:45 »
Neil - this is something that Exodus has talked about in the past :

http://www.thenakedscientists.com/forum/topic.asp?TOPIC_ID=42&SearchTerms=raindrop

Chris

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Offline neilep

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Re: How fast does your average rain drop...drop !!
« Reply #4 on: 23/03/2005 08:46:01 »
quote:
Originally posted by chris

Neil - this is something that Exodus has talked about in the past :

http://www.thenakedscientists.com/forum/topic.asp?TOPIC_ID=42&SearchTerms=raindrop

Chris

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 - Groucho Marx



DOH !!...thanks Chris.

Men are the same as women.... just inside out !!
 

Offline chris

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Re: How fast does your average rain drop...drop !!
« Reply #5 on: 23/03/2005 08:54:23 »
Neil - this is something that Exodus has talked about in the past :

http://www.thenakedscientists.com/forum/topic.asp?TOPIC_ID=42&SearchTerms=raindrop

Chris

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Offline BlazePascal

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Re: How fast does your average rain drop...drop !!
« Reply #6 on: 22/06/2014 21:26:45 »
Not to be controversial, but I'm sitting on my back porch in Florida during a summer storm, and I've been trying to answer this question using my own methodology. This is a heavy storm (a "frog strangler," as we would say in these parts). The raindrops are falling through my field of vision, which I estimate to be 10 feet vertically, in a period of time I would estimate to be between a tenth and a fifth of a second. (As a percussionist and piano tuner, I'm pretty good at estimating small time quanta.) That yields speeds between 100 feet per second and 50 feet per second, or 66 MPH and 33 MPH, somewhat higher than the above solid numbers.
 

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Re: How fast does your average rain drop...drop !!
« Reply #6 on: 22/06/2014 21:26:45 »

 

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