Explanation:

* Potassium nitrate is a highly soluble salt, and its solubility increases significantly with increasing temperature. This is because the dissolution process is endothermic, meaning it absorbs heat from the surroundings. As temperature increases, more heat is available to drive the dissolution process, resulting in a greater amount of potassium nitrate dissolving.

* Salt (sodium chloride) is a moderately soluble salt, and its solubility changes relatively little with temperature. This is because the dissolution process for salt is slightly exothermic, meaning it releases a small amount of heat. As temperature increases, the small amount of heat released during dissolution has a negligible effect on its solubility.

In summary:

* Potassium nitrate: High solubility, solubility increases significantly with temperature.

* Salt: Moderate solubility, solubility changes minimally with temperature.

Therefore, potassium nitrate's solubility is more affected by changes in temperature than salt.