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.
Essentially it states that if one needs a cheap source of AA sized batteries, by disassembling a 6 volt lantern battery, you will find 32 AA batteries inside of the 6 volt battery. Origins: This video purporting to demonstrate that 6-volt lantern. batteries are actually made up of a casing enclosing 32 AA batteries is just a gag, another form of âFoolâs Errandâ intended to lure people into trying (or at least believing in) something non-existent.