this post was submitted on 15 Aug 2025
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How many millilitres are in a gallon?
1l of (4°C) water weighs 1kg. 1kg (of anything) is 1000g. 1g of water is 1cm³. Stack 1000 1cm³ blocks to get a 10m high column. This column exerts 100kPa of pressure on its base. 1N would accelerate it by 1m/s every second. And to heat it by 1°C requires 1kcal.
Meanwhile if you convert feet to miles, you get 5,280, for some reason.
What next you are going to ask how many inches in a mile? Those are two units that aren’t used in the same context. I’d be like if I asked you how many seconds are in a year. Or if I asked you how big a notebook is in kilometers, rather than in centimeters.
A hybrid system really isn’t as wild of a concept as it sounds. We already just use conventional time keeping, metric is largely forgotten because of how unhelpful it was. https://metrictime.info/
Doesn’t mean you have to take all of the weird units and conversions from imperial but it means to cherry pick the best of both worlds so we have a system that just works with what real people use it for.
Ever converted a pound-force second into a Newton second? No?
Some non-metric country's space probe also didn't do that
how many ounces are in a cup? how about in a pound? how about how many tsp there are in 1/4 cup.