In a Bernoulli equation, used in pipe flow, each term represents

1. Energy per unit weight
2. Energy per unit mass
3. Energy per unit volume
4. Energy per unit flow length

Bernoullis equation is,

P	+	V²	+ Z = 0
ρg		2g

Where,	P	is pressure head
	ρg

V²	is kinetic head
2g

Z is potential head
Each term represents energy per unit weight