When a flat Earther tells you that water cannot curve
(media.conspiracies.win)
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Quote this "law".
I did.
"Barring negligible surface tension artifacts, the surface of water at rest is always flat, level, and horizontal."
The reason it is a law is because there are no measurements which contradict it. That's all laws are - repeated measurements of what is.
Prior to "newton's folly", there are many descriptions - both mathematical and, more commonly, in english of this law (aka phenomenon/behavior) which describe it plainly. After "newton's folly", the laws are surreptitiously changed to include fictional terms - but this is simply not acceptable in science. Laws are created from measurement. They cannot be changed (and should not) until and unless contradictory measurement is provided which warrants such a change.
From where did you pull this quote? Searching it yields zero results.
It's my quote.
Try the other one i mentioned if you are looking in more modern hydrostatics textbooks.
Otherwise, the older the hydrostaticks text, the more plainly it will tend to be written. The surface of still water (of significant surface area) is always level, flat, and horizontal.
What other one?
Do you have an actual source for this "law" that isn't yourself?
Yes, many. It is in a great many books on hydrostatics, and phrased a number of different ways (both mathematically, and more often - in english). One way it is described in modern textbooks is "Fluids at rest cannot resist a shear stress" or equivalent.
You seem to be misunderstanding what a scientific law is, and why.
We establish them by measuring what is, not what we imagine might be.
When we measure water's surface at rest, again - barring negligible surface tension artifacts, it is always flat, level, and horizontal. The "source" of this law, as well as the place to look for a citation validating (or invalidating, as it appears you hope) it is reality! Still, if you trust books more than you trust your own competence to assess reality - there are many available on hydrostatics.
Then for fuck's sake provide one. Why can't you?