How it works:
* Evaporation: When you heat saltwater, the water evaporates faster than the salt. This creates water vapor, which can be collected and condensed back into liquid water.
* Distillation: This process of evaporation and condensation is called distillation.
Why it's not complete purification:
* Salt Residue: While most of the salt will remain behind, some salt particles may get carried up with the water vapor. This is especially true if you're not using a very careful distillation process.
* Other Impurities: Saltwater often contains other dissolved impurities besides salt, such as minerals and bacteria. These impurities may also be carried up during evaporation.
Conclusion:
While heating salt water can remove a significant amount of salt, it's not a perfect method for complete purification. To achieve truly pure water, you would need a more complex purification process like reverse osmosis or multi-stage distillation.