Serial number

Fluid type

Density (g/cm⁻³)

Pressure gradient (psi/m⁻¹)

1

Natural gas

0.18

0.25

0.25

0.35

2

Oil

0.80

1.12

0.85

1.19

3

Fresh water

1.00

1.42

4

Salt water

1.07

1.50