Even carbon dioxide can dissolve in the groundwater, causing the water to be naturally carbonated. This water is sometimes sold as mineral water. Groundwater can be heated by magma below the Earth's surface. The heated water can create hot springs, springs with water that is naturally hot (Figure 13.23). Some hot springs are used as natural hot tubs and are considered therapeutic and spiritual by some people. However, hot springs can be dangerous, too.
We used a level tablespoon of salt in a cup of water. The batteries we have shown here are more correctly called cells. An actual battery is made up of two or more cells. The zinc-air cell produces about three quarters of a volt.
As for exactly what DOES make Duracell batteries better than others, that's a trade secret. Batteries create electricity through chemical action, two metals separated by an electrolytic paste. Various metals provide better performance, and alkalinity of the paste also affects it.eport Abuse. Used to be, batteries were just batteries. Everyone used the same materials and batteries lasted just about along as all the others. Then along came Duracell and started making a business out of creating the longest lasting battery by exploring various chemicals and combinations.