The pressure due to a liquid in liquid columns of constant density or at a depth within a substance is represented by the following formula:

  
    
      
        p
        =
        ρ
        g
        h
        ,
      
    
    {\displaystyle p=\rho gh,}
  where:

p is liquid pressure,
g is gravity at the surface of overlaying material,
ρ is density of liquid,
h is height of liquid column or depth within a substance.Another way of saying the same formula is the following:

  
    
      
        p
        =
        
          weight density
        
        ×
        
          depth
        
        . {\displaystyle p={\text{weight density}}\times {\text{depth}}.}
This is the same speed the water (or anything else) would have if freely falling the same vertical distance h.

Kinematic pressure
P
        =
        p
        
          /
        
        
          ρ
          
            0
          
        
      
    
    {\displaystyle P=p/\rho _{0}}
  is the kinematic pressure, where 
  
    
      
        p
      
    
    {\displaystyle p}
   is the pressure and 
  
    
      
        
          ρ
          
            0
          
        
      
    
    {\displaystyle \rho _{0}}
   constant mass density.