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Interesting fact of the day: One gallon of gasoline weighs 6.3 lbs and when burned produces 20 lbs of CO2
I just heard today that plants are made mostly of air, and a little water. Most of the structure of plants are carbon from CO2, and hydrogen from the rain. Just a very small amount is minerals from the soil.
@Pat 100% correct. This little known factoid was in fact popularized by feynman in his bbc talk.
@freemo
That's exactly where I heard it!
@Pat Figures :)
Then if you bury those plants underground and wait a few million years, you can pump out those hydrocarbons and burn them so there is more CO2 for the plants again. (sarcasm)
@freemo This is probably a big part of why batteries are heavy.
@freemo In a similar vein: humans _produce_ a few hundred ml of water per day.
@robryk indeed, most processes that consume energy tend to.
@freemo
And almost 9 pounds of water ( if I did my math right)