Chemical Engineering - Fluid Mechanics - Discussion
Discussion Forum : Fluid Mechanics - Section 1 (Q.No. 1)
1.
The fluid property, due to which, mercury does not wet the glass is
Discussion:
45 comments Page 2 of 5.
Mohit said:
6 years ago
The reason is cohesion. Due to cohesive force between the molecules of mercury droplet it shows high surface tension and which is also the cause of capillary fall in capillary tube. Higher the cohesiveness lesser the tendency to wet the surface.
Afja said:
11 months ago
The fluid property due to which mercury does not wet the glass is *cohesion*.
Mercury has strong cohesive forces between its molecules, which leads to high surface tension and prevents it from spreading out and wetting the glass surface.
Mercury has strong cohesive forces between its molecules, which leads to high surface tension and prevents it from spreading out and wetting the glass surface.
(2)
Jdp said:
2 years ago
In the case of Mercury, if we put a tube inside the beaker full of mercury then the level of mercury in the tube will fall and the tube doesn't get wet because cohesive force is more than adhesive force. This property is called adhesion.
(4)
PANKAJ said:
10 years ago
Surface tension and viscosity are properties of fluid.
So last two option are eliminated and no question of viscosity because viscosity is resistance to the relative motion of fluid layers so answer is surface tension.
So last two option are eliminated and no question of viscosity because viscosity is resistance to the relative motion of fluid layers so answer is surface tension.
Deepika.M said:
1 decade ago
It is the cohesion force that predominates in mercury and hence the molecules of mercury tend to remain together as cohesion is attractive force between like particles. Hence the glass surface doesn't get wet.
Avtar Singh said:
9 years ago
Yes, surface tension includes fluids cohesive forces, Cohesion is the property in which liquid molecules attract each other and remain a continuous mass. So true answer is surface tension.
Raghvendra kumar said:
1 decade ago
Dear friends,
A/c to me, surface tension is responsible for this case. Cohesion b/w molecules of mercury is greater than adhesion b/w mercury and glass and theta is equal to 128 degree.
A/c to me, surface tension is responsible for this case. Cohesion b/w molecules of mercury is greater than adhesion b/w mercury and glass and theta is equal to 128 degree.
Sagar said:
4 years ago
Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension.
So, option A right.
So, option A right.
(1)
Santhosh said:
1 decade ago
Actually both answers, surface tension & cohesive are correct but in the question they asked fluid property not a force that's why the answer is surface tension.
Akil Suhail said:
6 years ago
I think Cohesion, surface tension is produced by cohesion. Cohesion is attractive force within the same type molecules, of this opposite is adhesion.
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