“This year we have a new sensor on Apple Watch and we think that you’re going to love it…”
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Hah, that reminds me of an old Penny Arcade strip. Never thought about the Maxis-Apple crossover jokes until now…
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Depends on context and political orientation as which is measure is used. Pubs pull pints in … well pints. Milk is now sold in litres. Jacob Rees-Mogg, a Conservative MP, when a minister instructed his staff to only use imperial measures in official communications! But JRM thinks he lives in the 16th century not the 21st.
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This 
Characters to hit the limit
My wife bought me a gallon water jug while I was lying in the emergency room because of a kidney Stone. Worst pain in my life and it was a tiny one.
When I was in the army, more water cured everything, except for the time it almost killed a guy because he drank too much water.
The wisdom that got thrown around beyond the pee color chart was if you’re thirsty you’re two cups dehydrated already. I drank so much water in the army I could have been classified as the navy.
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It never did make any sense to me. Eight glasses is a great deal.
Assuming you’re younger or middle-age (i.e. not in your 90s), assuming you’re female, the science says your body likely has a need about 90-ish ounces of water per day. That can come from water, coffee, tea, water absorbed in food, etc.
But it has to come from somewhere. 
is this similar to the goal of 10,000 steps a day
I agree, so I only avoid some fads.
(sorry, couldn’t stop myself)
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Maybe.
All of these ‘targets’, like eating 5 portions of fruit and vegetables a day or drinking 8 glasses of water or walking 10,000 steps are readily memorised health messages that will probably do you some good, and are unlikely to do harm. They gain traction because the more nuanced and personalised targets are challenging to market, and are unlikely to be picked up by popular media.
Personally, I feel better if I drink several glasses of water a day, and it’s less expensive than most health fads! If I’m also avoiding a kidney stone, then bonus!
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And sometimes just aren’t even available. Getting a definitive, down-to-the-ounce “you need this amount of water per day” would be challenging, especially since it might fluctuate day-to-day. Also, like many things, the process of trying to get it perfectly correct has the ability to derail the whole effort.
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You can get pretty close as hospitals frequently have to do when monitoring a patient’s recovery. Many years ago I worked some of my college years as a nursing assistant and had to pay attention to this.
Your comment has stayed with me. Humor with truth at its core.
Even in a stationary hospital, they could only measure around 2/3 of the fluid leaving the body.
So it still remains, even with all the technic they could use in our days on a stationary system, only a more or less rough guess…
Sure, but it is still a useful guess as far as patient care goes.
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Reminds me of the distinction between precision and accuracy… sometimes an approximation can be more useful and a precise answer!
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My dad was talking about that sort of thing when he took a state HVAC licensing exam. You CAN do a bunch of math and calculate that the customer’s home requires a 52,347 BTU furnace. And that’s the correct answer as far as an exam.
But in the real world, furnaces are sized in 5,000 or 10,000 BTU increments, so precision is irrelevant. What IS relevant is the approximate size you think the house would need, and the list of considerations regarding whether or not you should size up or size down given that the house isn’t likely an exact fit to any of the standard sizes.
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