Viscosity is important to understand why a liquid will act level when compressed by a force, and reacting with a normal force.

Okay, I think we got off on the wrong foot

what is level or you @Flat Earth PhD ?

Anyways, good luck to you both.

level is literally defined by water

For now, I'm heading back to my work.

Aye m8@Thinky

@Flat Earth PhD Thats not a definition. What *IS* level?

https://en.wikipedia.org/wiki/Water_level_%28device%29

Right, so a straight line between to points would be level?

nope

Please give me a word definition I can work with, otherwise this will be a fruitless conversation

Oh my, look, fluid dynamics.

P = P[atm] + pgh

P[g] = pgh

Enjoy those two.

Anyways, I'm off.

irrelevant

strawman

we're talking simple geometry

Not if you believe water is level

Then you ought to solve for it yourself.

water level was known before fluid mechanics. stop trolling

Are you going to give us your definition of level?

I did. water

No, water is a fluid.

or you could say the plane of the surface of water

Level would be a straight line between A and B with a 0º incline.

That would be level for example

Would that definition work for you?

no

OOF

what is defining the incline? relative to what?

water

Please read again what I wrote.

I can draw a line wiht 0 degree incline to another line

or....the plane perpendicular to a plumb bob

A horizontal plane or line with respect to the distance above or below a given point.

no

level is very specific

yes

NO