• 0 Posts
  • 46 Comments
Joined 1 year ago
cake
Cake day: July 6th, 2023

help-circle









  • Ah. I see the angle you’re coming from. I had mentioned in another comment somewhere that essentially all salt without an impermeable barrier between it and the water on this planet would be dissolved (provided it doesn’t saturate the water which would be a horrifically enormous amount of salt). Salt is highly soluble in water and on any timescale that could be relevant would fully dissolve and achieve a general equilibrium. If the planet has water, then it has a star able to warm the planet. There’s no realistic scenario that wouldn’t result in the ocean fully mixing.




  • Overall composition of a planet is what would matter, not whether there is land. If there is salt on the planet, it would almost assuredly have salty oceans. Salt diffuses in water. If you put salt into a glass of water and leave it sit, eventually the salt would dissolve and mix completely. Salt water has a different density than water. The act of dissolving involves energy changes. These create small eddies and currents that would mix the water until it was in equilibrium. If there is salt in any form on your waterworld, the only way it wouldn’t be salty is if the salt was permanently separated from the water physically.


  • The reason water is concentrated in oceans isn’t specifically due to continents existing. Salt doesn’t evaporate so all rain is fresh water. That fresh water falls. When it falls over land it flows to the lowest point it can go. This leads to all flowing water flowing towards oceans and seas. Salt won’t travel upstream. Ergo salt simply stays in oceans and seas.

    Now consider a world with no land. This wouldn’t really differ from a single ocean on earth. Currents and waves will move in all directions at some point which should mix the salt all around. You could get some differences if there were ice caps or icebergs. Those could behave similarly to continents depending on size.