The discussion revolves around the conditions under which gravity overcomes surface tension, particularly in the context of creating a scale model of Earth to address claims made by flat earthers. Participants explore the theoretical implications of this balance between gravitational and surface tension forces.
Participants express differing opinions on the value of the discussion, with some viewing it as a worthwhile physics challenge while others consider it a waste of time. The discussion does not reach a consensus on the practical implications of the inquiry.
The discussion involves assumptions about the applicability of the Bond number and its critical value, as well as the definitions of gravitational and interfacial energies. There are unresolved questions regarding the specific formulas that may apply to the scenario.
Individuals interested in fluid dynamics, gravitational physics, and the interplay between surface tension and gravity may find this discussion relevant.
physnoct said:I want to demonstrate to flat earthers...
physnoct said:I want to demonstrate to flat earthers that water does indeed stick to a ball. If we want to do a scale model of the earth, at which radius will gravity overcome the surface tension?
For FEers, maybe. The question itself is worth an answer, as it is an interesting physics challenge and I would like to know the answer.CWatters said:That would be a waste of time.
That's a good start! I'll check that. Thanks!Andy Resnick said:The Bond number (Eotvos number) is the ratio of gravitational and interfacial energies: when the Bond number is high, gravity dominates and vice-versa. So all you need to do is write down the Bond number for your scale model and determine what the critical value of 'planetary' mass is (when Bo = 1)
Is there a formula that I can use?CWatters said:Put a drinking straw into a glass of water and the water will rise up the straw until gravity "overcomes" surface tension.