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Cloak of Wisdom
(lemmy.world)
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this post was submitted on 07 Jul 2023
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Hmmm let's see, you need roughly 2.39kcal or 10kJ of fuel a day.
Gasoline has an energy density of 45 MJ/kg.
https://energyeducation.ca/encyclopedia/Energy_density
Sciencing those together means you need 0.00022 kg or 0.22g of gasoline a day
Gasoline has a mass density of 0.7475 g/cm^3, more sciencing means you need 0.294 cm^3 of gasoline by volume.
https://www.engineeringtoolbox.com/fuels-densities-specific-volumes-d_166.html (average across range and convert to g/cm^3)
Here let's pull a number out of our butts, let's say a drop is a sphere with a diameter of 5mm, so the radius is 0.25cm. Volume is 4/3 pi r^3 which comes out to 0.065 cm^3/ drop.
0.294/0.065 gives 4.5 drops.
So you'd need 5 drops of gasoline to get your days worth of energy.
Seems we're off by a factor of a thousand. Most likely you doubled up on 1Calorie = 1000 calories. (Damnit food industry, what the hell?!?) 1kcal is already converted to the base calorie, as opposed to 1kCal.
https://www.ncbi.nlm.nih.gov/books/NBK234938/#:~:text=For%20men%20of%20reference%20body,women%2C%20it%20is%202%2C200%20kcal.
You are correct!
big Calories are conventionally uppercase, while small calories are conventionally lowercase. So 1 Calorie = 1000 calories = 1 kcal.
Stupid naming system, I know.