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Vishrant Vasavada Grade: 11
        If the Bernoulli's equation may be written as P + 1/2 p v^2 + hpg = k (constant) where P is pressure, p is density, v is velocity and h is height, find out unit and dimensional formula for k/pv^2.
8 years ago

Answers : (3)

Ramesh V
70 Points

the constant k(total head) has dimensions of pressure head i.e., N/m2 with dim. formula ML-1T-2


so unit and dimensional formula for k/pv^2 is Dimensionless(no units) and formula is M0L0T0

8 years ago
AskIITianExpert Srijan.iitd
8 Points

pv^2 is having the same dimention as the constant k  because we kno that for two physical terms to be summable they should have same dimentions,hence all terms on left hand side have same dimentions.Also dimention of left hand side of any physical equation must have same dimention as the right hand side ,hence constant k have same dimentions as the terms "P", P v^2 and hpg.

hence the term k/pv^2 is dimentionless!!!=> M^0L^0T^0.

8 years ago
AskiitianExpert Shine
10 Points


For the statement to be dimensionally correct, every term should have the same units. This means P, (pv^2)/2 , hpg and k should all have same units.

Hence, the term k/(pv^2) should be dimensionless.

8 years ago
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