Bernoulli’s equation is written as P + ½ ρ v2 +ρ g h = constant. Each figure represents a factor in the Bernoulli principle, and the sum in the system will be the same, regardless of what changes in the formula. The formula contains the following elements: Pressure + ½ density * square of the velocity + density * gravity. acceleration* height = constant. The ‘constant’ is a result of the energy conservation principle.