Please only carry out this experiment with the permission and supervision of an adult! In this interesting experiment, you can visualise the way that salt is produced in the salt mine and the salt works, on a small scale in your home. Weigh out 30 g of salt – this will be your own little mountain of salt. Dissolve the salt in a pot – you've now produced the brine. Start your own salt works by placing the pot on the cooker and boiling the brine (now you're a genuine "salt boiler"!) Boil the brine carefully until all of the water has evaporated.  Watch out! Don't let the salt burn.  Once the water is gone, all that remains in the pot is a white crust. Scrape it out and taste it!  This is pure salt.  When you weigh the extracted salt, it will be exactly 30 grammes.  The salt that was dissolved and disappeared in the brine has reappeared.