Can Liquid Metals Defy Gravity and Form Perfect Spheres While Falling?

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    Falling Liquid Metal
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Discussion Overview

The discussion revolves around the behavior of liquid metals when falling, specifically whether they form droplets or maintain different shapes, with a focus on the formation of spheres due to surface tension. The scope includes theoretical considerations and practical applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that liquid metals can form good spheres when falling, citing historical methods of producing lead shot.
  • Others mention that surface tension plays a significant role in shaping liquid metals into spheres, especially in free fall or weightlessness conditions.
  • A participant suggests that the gravitational pull of the liquid's own particles is negligible compared to the effects of surface tension.
  • Concerns are raised about the influence of air friction on the shape of falling droplets, comparing it to the behavior of water in the atmosphere.
  • It is noted that liquid metals may have stronger surface tension than water, which could affect their droplet formation.

Areas of Agreement / Disagreement

Participants express varying views on the factors influencing the shape of falling liquid metals, particularly regarding the roles of surface tension and gravitational effects. No consensus is reached on the primary mechanisms at play.

Contextual Notes

Some assumptions about the behavior of liquid metals in different gravitational conditions remain unaddressed, and the discussion does not resolve the complexities of the interactions between surface tension and gravitational forces.

Brage Eidsvik
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Will liquid metals create droplets when falling or will they create different shapes?
 
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Welcome to PF;
They can form quite good spheres ... this is how lead shot used to be made.
Munitions companies would feed molten lead through a seive at the top of a tower, and it would literally rain little metal balls at the bottom.
http://www.ipenz.org.nz/heritage/itemdetail.cfm?itemid=2228
 
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Simon Bridge said:
They can form quite good spheres ... this is how lead shot used to be made.

Yup ... and ball bearings :smile:
 
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I believe in free fall all liquid will ball up do to the surface tension the same way they do on iss or even in deed space without any gravitational fields around to react on it there's a name for this but i just can't remember it right now and i know that rain / water when it falls in the sky it pancakes a little bit because of the air friction when falling

throw some would say that the balling effect in free fall or weightlessness is do to the gravitational pull of all the fluids particles on ever other particles in the fluid like the sun and the planets do but for smaller thing i think it the surface tension

hope this helps:cool:
 
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hsdrop said:
throw some would say that the balling effect in free fall or weightlessness is do to the gravitational pull of all the fluids particles on ever other particles in the fluid like the sun and the planets do but for smaller thing i think it the surface tension

The contribution from the droplet's own gravitational pull on itself is vanishingly small. The effect is essentially 100% from surface tension.
 
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Brage Eidsvik said:
Will liquid metals create droplets when falling or will they create different shapes?
They can have stronger surface tension than water, that pulls them into a sphere:

https://en.wikipedia.org/wiki/Mercury_(element)
 

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