Water seems to just be the right tool for the job in many applications. It always seemed funny to me that we have not found a better option to generate electricity over the years. Most large scale generators, no matter how complex, is just using something to heat up water and spin a really big fan in order to spin a really big magnet.
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There are two parts to why that is: Water is actually extremely good for a wide variety of applications, including this one.
And generally speaking, we have ready access to a *lot* of water. There are maybe some applications where you could devise a custom-designed substance to eek out marginally better efficiency, and there may be some situations where that is worth it.
But for most things we use water for most of the time, it has the major advantages of being clean, cheap and extremely easy to get your hands on relative to anything else you might want to use.
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