Detection of specific gravity
Principle---Specific
gravity of urine depends upon the solute present in the urine.When solutes
increases ,specific gravity of urine also increases.
Specific
gravity is the density of substance ,which is compaired to density of water.
Density of water is 1.
Specific
gravity of normal urine is—1.012 to 1.025.
Urinometer
is used to measure specific gravity of urine.
Parts
of Urinometer---1) Stem---is elongated & graduated.
2) Base –is rounded and heavy.
Graduation
on stem is1.000 at the top & 1.060 at the bottom .
Procedure---Take
20 ml of urine in vertical cylinder.Take another cylinder & fill it with distilled
water.Now hold the urinometer with its stem & gently release the urinometer
in the cylinder containing distilled water.Let the urinometer float and become
stable.When it becomes stable measure the specific gravity of distilled
water.----which is 1.
Now
hold the urinometer at the top & slowly release the urinometer in the
cylyndercontaining urine.Urinometer should float in the urine & should not
touch the sides of cylinder.When urinometer becomes steady then take the reading of specific
gravity from the graduations on the stem.Take reading of the lower curvature of
the fluid.
Keep
the urinometer clean with fresh water and dry it with tissue paper.
