Water is the only known non-metallic substance that expands when it freezes; its density decreases and it expands approximately 9% by volume.

During freezing, water molecules lose energy and do not vibrate or move around as vigorously. This allows more stable hydrogen-bonds to form between water molecules, as there is less energy to break the bonds. Thus water expands as it freezes, and ice floats atop water.

When liquid water reaches a low enough temperature, it freezes and becomes a solid—ice. When solid water is exposed to enough heat, it will melt and return to a liquid. As that liquid water is further heated, it evaporates and becomes a gas—water vapor.

Since, density of water is greater than ice. Therefore, mass of water is greater than ice.

A given amount of water, when frozen, will weigh exactly the same as it did when it was liquid. An equal volume of water, when frozen, will actually weigh less than an equivalent volume of a liquid, since water actually becomes less dense when it becomes a solid.

Sparkling water hydrates you just as much as regular water. Thus, it contributes to your daily water intake. In fact, its fizziness may even enhance its hydrating effects for some people. Nonetheless, you should choose sparkling water without added sugar or other sweeteners.

As long as there are no added sugars, sparkling water is just as healthy as still water. Unlike sodas, carbonated waters don’t affect your bone density or greatly damage teeth. They can make you feel gassy or bloated, so you may want to avoid them if you have gastrointestinal issues.

Yes, you can drink distilled water. However, you might not like the taste because it’s flatter and less flavorful than tap and bottled waters. Companies produce distilled water by boiling water and then condensing the collected steam back into a liquid.

You should avoid drinking water left open for a very long time. The water left overnight or for a long period of time in an open glass or container is home to numerous bacterias and is not safe for drinking. You never know how much dust, debris, and other small microscopic particles might have passed into that glass.

Symptoms of gastrointestinal illness from contaminated water can include diarrhea, abdominal cramps, nausea and vomiting. Those symptoms can take 24 to 48 hours to develop, says Forni, so you might not get sick for a day or two after drinking bad water.

Water can become stagnant in as little as 24 hours, mold and bacteria also begins to grow within 48 hours. Mold can colonize within 12 days. This rapid growth will continue and go unseen for days if you are unaware of the stagnant water.

The length of time potable water can be stored safely ranges anywhere from a single day to indefinitely depending on how you are storing the water and the purity level of the water, to begin with. Clean water that is left in an open cup outside is likely to go bad (become contaminated) within 1-3 days.

While it’s true that properly stored water should never expire, even filtered water tastes bad after sitting long enough. If you’re storing water in the refrigerator for everyday drinking, you’ll want to change it more often to keep it tasting its best. In this case, replace any remaining water once a month.

Have bottled water stored in a designated area, and make sure it meets general water storage requirements—at room temperature and not in direct sunlight. If you are storing bottled water for emergency purposes, it is recommended to keep spring water stored for no more than one year!