Final volume of a falling droplet

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    Falling Final Volume
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Discussion Overview

The discussion centers on whether falling droplets reach a final volume similar to how falling bodies reach a final velocity. Participants explore the conditions under which a droplet's volume might change during free fall, particularly focusing on a semen droplet falling from a height of 1 kilometer.

Discussion Character

  • Exploratory
  • Debate/contested

Main Points Raised

  • One participant questions if falling droplets have a final volume and seeks a method to determine this for a specific liquid and height.
  • Another participant asserts that water is effectively incompressible, suggesting that while the shape of a droplet may change, its volume remains constant.
  • A different participant notes that evaporation may occur during the fall, which could affect the final volume, depending on environmental conditions such as temperature and humidity.
  • One participant speculates about the size of droplets that could form from a large volume of water, suggesting that larger drops may break apart during the fall, leading to a maximum size limit.

Areas of Agreement / Disagreement

Participants express differing views on whether the volume of a falling droplet remains constant or changes due to factors like evaporation and droplet size. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are assumptions regarding the conditions affecting evaporation and droplet formation that are not fully explored, such as specific environmental parameters and the physical properties of the liquid in question.

eng442
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First of all, do falling droplets have a final volume like falling bodies have a final velocity - in air?

If so, is there a way to determine such volume for a specific liquid and a specific height? More specifically, the final volume of a semen droplet falling from a 1km height.
 
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welcome to pf!

hi eng442! welcome to pf! :smile:

water is, for all practical purposes, incompressible

so (although the shape may change) the volume will be constant :wink:
 
eng442 said:
<snip>More specifically, the final volume of a semen droplet falling from a 1km height.

Eh?

There will be some evaporation, but that depends on the details- temperature(s), relative humidity, etc..

Odd question...
 
eng442 said:
First of all, do falling droplets have a final volume like falling bodies have a final velocity - in air?

If so, is there a way to determine such volume for a specific liquid and a specific height? More specifically, the final volume of a semen droplet falling from a 1km height.

I have never seen rain drops the size of breasts, even small breasts, though possibly the size of a nipple. So yes, if you could form a very large drop of water, say the size of your typical breast then after falling for a kilometer the large drop would break apart towards some maximum size. If on the other hand you had a cubic kilometer of water and could drop it a distance of one kilometer, all at once, I think you might have some very large drops?
 

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