Who knows the relationship between air density, air velocity and pressure? We need a formula

Who knows the relationship between air density, air velocity and pressure? We need a formula

When the pressure changes little, the air density can be considered constant and the position pressure difference can be ignored, the relationship among air density, air velocity and pressure can be expressed by the energy equation of air flow: P1 + ρ V1 ^ 2 / 2 = P2 + ρ V2 ^ 2 / 2 + PW, where: P1, P2 - the relative pressure of section 1 and 2, called static pressure; ρ V1 ^ 2 / 2, ρ V2 ^ 2 / 2

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