. Manometry - Hydrostatic Law, Conversion of one fluid column to another fluid column

2. Manometry

 Hydrostatic Law:- For downward ‘h’ 

 dp/dh = w 

 For upward ‘h’ 

 dp/dh= -w 

 Hydrostatic pressure Flows linear variation of depth below the free surface.

4. Conversion of one fluid column to another fluid column:- 

 ρ1 h1=ρ2 h2 

s1 h1=s2 h2

 Here,

 ρ = Density of fluid 

 s = Relative Density 

 Piezometer is suitable for small and positive pressure measurement. The manometric liquid should have high density and vapour pressure Simple manometer /U-tube manometer can measure both positive and negative pressure. Aneroid / mercury barometer used to measure local atmospheric pressure on absolute scale. Density of mercury = 13.6 ×〖 10〗^3 kg/m3 Density of air = 1.24 kg/m3