Weight density or specific weight is defined as the weight per unit volume of a liquid at a standard temperature and pressure. Weight density or specific weight is usually denoted by w. Weight density or specific weight is expressed in kN/m3 or N/m3 or N/mm3.
Mathematically, weight density or specific weight,
w = ρ.g
Note: For water, w = 9.81 kN/m3 = 9.81 x 103 N/m3 = 9.81 x 10-6N/mm3.
102) The specific weight of water in S.I. units is taken as
Answer is:
9.81 kN/m3
Explanation:
Related Hydraulics and fluid mechanics MCQ with Answers
Answer is:
one-third of the total supply head
Answer is:
Weber's number is the ratio of inertia force to surface tension force.
Explanation:
The important dimensionless numbers in fluid mechanics are
1. Reynold’s number
2. Froude’s number
3. Weber’s number
4. Euler’s number
5. Mach’s number or Cauchy’s number
Reynold’s number: Reynold’s number is the ratio of inertia force to the viscous force.
Froude’s number: Froude’s number is the ratio of inertia force to the gravity force.
Weber’s number: Weber’s number is the ratio of inertia force to the surface tension force.
Euler’s number: Euler’s number is the ratio of inertia force to the pressure force.
Mach’s number or Cauchy’s number: Mach’s number or Cauchy’s number is the ratio of inertia force to the elastic force.