* Dissolving is primarily a surface phenomenon: The process of dissolving involves the interaction of the crystal surface with the solvent molecules. The bulk pressure of the air doesn't directly affect this interaction.
* Solubility is governed by other factors: The solubility of a crystal in a solvent is primarily determined by:
* Temperature: Increased temperature generally increases solubility.
* Nature of the solute and solvent: The chemical properties of the solute and solvent determine how well they interact.
* Concentration: The amount of dissolved solute already present affects the rate of further dissolving.
Exceptions and Considerations:
* Very high pressure: Under extremely high pressures (not typical conditions), there might be some minor effects on solubility due to changes in the density and properties of the solvent. This is more relevant in specialized fields like geochemistry.
* Gases in liquids: If you are dissolving a gas in a liquid, air pressure will have a significant impact, as the amount of gas dissolved will be directly proportional to the partial pressure of the gas above the liquid.
In summary: For most everyday dissolving situations, air pressure is not a major factor. The other factors listed above are far more important in determining how quickly and how much of a crystal dissolves.
