Hydraulics and Fluid Mechanics Section 2 - Mechanical Engineering Questions and Answers Discussion Page 2 For Q.35 By Most Detailed

Rajendra singh said: 1 decade ago

Viscosity of mercury is lesser than of water, because shear stress developed in water is more than mercury, this is taken from the relation viscosity is directly proportional to the shear stress and inversely proportional to velocity gradient.

Kajal said: 8 years ago

Viscosity of mercury is lesser than of water, because shear stress developed in water is more than mercury, this is taken from the relation viscosity is directly proportional to the shear stress and inversely proportional to velocity gradient.

Gopal Raut said: 8 years ago

Viscosity of mercury is lesser than of water, because shear stress developed in water is more than mercury, this is taken from the relation viscosity is directly proportional to the shear stress and inversely proportional to velocity gradient.

Nirav said: 9 years ago

Dynamic viscosity of water is less than that of mercury. But kinematic viscosity of water is higher than that of mercury, this is because mercury is a lot denser than water. Kinematic viscosity is the ratio of dynamic viscosity and density.

Kajol Adhav said: 3 years ago

Mercury has a higher dynamic viscosity than water. Water's dynamic viscosity at 20°C is 1.005 centipoise. Mercury's dynamic viscosity at 20°C is 1.6 centipoise.

Hence dynamic viscosity of water in comparison to mercury is lower.

(3)

Pradeep gk said: 8 years ago

The kinematic viscosity is the dynamic viscosity divided by the density. Mercury is a lot denser than water, so its kinematic viscosity is lower than the kinematic viscosity of water. But that's just because mercury is very dense.

Farcher said: 9 years ago

It is cohesive forces (forces between atoms/molecules of the same type eg water to water) which are important not adhesive forces (forces between atoms/molecules of different type eg water to glass).

MAZHAR IMAM said: 9 years ago

Kinematic viscosity of mercury is less than of water. But dynamic viscosity is greater.

The Kinematic viscosity is the ratio of dynamic viscosity and density. And mercury is more denser than water.

Prashant said: 4 years ago

Here, it is mentioned only viscosity it means here we are talking about the Dynamic viscosity and the dynamic viscosity of water is lower than mercury.

So, the answer will be Option B.

Faysi said: 5 years ago

The kinematic viscosity of water is greater than mercury because the density of mercury is more than that of water. But dynamic viscosity of mercury is greater than water.

Thank you.

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