Off the top of my head…
Availability and affordability, as it is the most common liquid on the planet.
Being a singular substance, rather than a mix of others, meaning it can be contaminated, but not destroyed, by most processes.
Relatively easy to purify, via filtering, boiling, etc.
Relatively non toxic.
Relatively non compressible as a liquid, which is useful in various applications.
Highly reusable in processes such as steam powered turbines.
I’m sure there are other particular chemical characteristics that make it useful in specific applications.
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