Advertisements
Advertisements
प्रश्न
Distinguish between cohesive and adhesive forces.
Advertisements
उत्तर
| Cohesion Force | Adhesion Force | |
| 1. | The force between the like molecules which hold the liquid together is called ‘cohesive force’. | When the liquid is in contact with a solid, the molecules of these solid and liquid will experience an attractive force which is called ‘adhesive force’. |
| 2. | A strong force of cohesion forms water droplets on any surface. | A strong adhesion force causes the liquid to spread all over the surface. |
APPEARS IN
संबंधित प्रश्न
Which of the following graphs may represent the relation between the capillary rise hand the radius r of the capillary?

Water rises in a vertical capillary tube up to a length of 10 cm. If the tube is inclined at 45°, the length of water risen in the tube will be
A 20 cm long capillary tube is dipped in water. The water rises up to 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be
A cubical box is to be constructed with iron sheets 1 mm in thickness. What can be the minimum value of the external edge so that the cube does not sink in water? Density of iron = 8000 kg/m3 and density of water = 1000 kg/m3.
What will be the shape of the liquid meniscus for the obtuse angle of contact?
What are the factors affecting the surface tension of a liquid?
Obtain an expression for the surface tension of a liquid by the capillary rise method.
Water rises in a capillary tube of radius r upto a height h. The mass of water in a capillary is m. The mass of water that will rise in a capillary of radius `"r"/4` will be ______.
The angle of contact at the interface of water-glass is 0°, Ethylalcohol-glass is 0°, Mercury-glass is 140° and Methyliodide-glass is 30°. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is ______.
A soap film of surface tension 3 × 10-2 formed in a rectangular frame can support a straw as shown in Fig. If g = 10 ms-12, the mass of the straw is ______.

