Explain Like I'm Five | Don't Panic!

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The original was posted on /r/explainlikeimfive by /u/SirDrumpf on 2023-06-23 12:31:45+00:00.

What is actually the simplest answer why hydrogen is not feasible yet for a replacement of our usual ways to heat buildings or drive cars. I heard that Hydrogen makes sense for larger vehicles that have to drive for a lot of miles but smaller ones are not really in development outside of toyota's experiments. Is there already a way to when it could get feasible?