Page 29 - ebook fluid mechanics_finalize

FLUID MECHANICS

Example 5 :

Calculate the specific weight, density and specific gravity of one liter of a liquid with 7 N

weight.

Solution :

Given :

1 1
3
Volume, V=1 liter = m [ 1liter = m 3 or 1 liter = 1000 cm 3 ]
1000 1000
Weight, W = 7 N

(i) Specific weight () = weight, W = 7 N
volume, V  1 
  m 3
 1000 

3
= 7000 N/m .

(ii) Density (ρ) =  = 7000 kg / m = 713.5 kg/m .
3
3
g . 9 81

(iii) Specific gravity (S) = Density of liquid = 713 5 . = 0.7135.
Density of water 1000

3
[ Density of water = 1000 kg/m ]

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