Because they don't like each other.
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The water has turned into steam and boiled away.
Hardness of water pertains to the concentration of minerals and other trace elements in your local water supply. Well water-such in my area is "very hard"-meaning it contains a large amount of iron and other minerals-when boiled down in a pot of the water on your stove-it will leave a deposit on the pan once the water has boiled away. A water softener helps filter out these particles.
it would have boiled away into the atmosphere
The liquid simply steams away, so eventually you will end up with no water at all.
The salt solution is boiled until the water has evaporated away, leaving salt crystals behind.
The bubbles are most likely dissolved gases (such as oxygen or carbon dioxide) coming out of the water as it warms up. These gases are less soluble in warmer water, so they escape and form bubbles as the water temperature changes.
The bubbles in boiling water are steam or vaporized water. The bubbles initially do not reach the surface of the billing fluid as the colder water away from the hot bottom cools the steam turning it back to liquid. WHen all the water is at 100oC the bubbles reach the top.
Water has 3 states, solid(ice), liquid(water, and gas(Water vapor). When water is boiled, it gathers heat energy. It then becomes a gas , breaking away from other water particles. it gathers together on a colder surface and loses some of that energy, reverting it back to water.
To make bubbles go away in the bath, you can simply wait for them to naturally dissipate or use a towel to skim them off the surface of the water. Alternatively, adding a small amount of vinegar or rubbing alcohol can help break down the bubbles more quickly.
To effectively remove bath bubbles from your bathtub, simply drain the water and rinse the tub with warm water. Use a sponge or cloth to wipe away any remaining bubbles. You can also use a mild soap or bathroom cleaner if needed.
it runs away
The salt solution is boiled until the water has evaporated away, leaving salt crystals behind.