Question 439711
Can you please provide me about the formula how can i calculate how many liters of water in a 100mm of 1 meter long round pipe 
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It's a cylinder.  r = the radius of the ID of the pipe, h = the length.
{{{Vol = pi*r^2*h}}}
If you mean the ID = 100 mm, that's 10 cm and r = 5 cm.  1 meter = 100 cm
{{{Vol = pi*25*100}}} cc
Vol = 2500*pi cc = 2.5*pi liters
=~ 7.85 liters