What is the constant in Bernouli's equation

[imatreyu]

Yeah. I'm just really confused.
I don't understand Bernouli's equation at all.

My textbook (by Serway and Faughn) says: "Bernouli's equations says that the sum of the pressure, the kinetic energy per unit volume, and potential energy per unit volume has the same value t all points along a streamline."

So if I want to solve for y (for example)
and I know P, density, v, and g. . .
How do I solve:

P + .5(density)v^2+density*g*y=constant

does "constant" have a value?
This would really help me do a homework problem.

Thank you guys!
:)

 

[rock.freak667]

That just means that the sum at state 1 is the sum at state 2

i.e.

P₁ + .5ρv₁²+ρgy₁=P₂ + .5ρv₂²+ρgy₂

 

[imatreyu]

Thank you!
That really cleared it up for me.