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Why is water rise in capillary tube wheras mercury falls in capillary tube?
This happens due to the difference in adhesive and cohesive forces. Water molecules are more attracted to the walls of the tube (adhesive forces) than to each other (cohesive forces), causing water to rise. Mercury has stronger cohesive forces compared to adhesive forces, so mercury is more attracted to itself than to the walls of the tube, causing it to be depressed or fall in the capillary tube.
Why does water drop spread on glass surface while mercury does not?
Water has stronger adhesive forces than adhesive forses. Mercury on the other hand has stronger cohesive forces than adhesive. cohesive forces hold molecules of the same substance together , vice-versa for adhesive forces
Why a drop of water adopts sperical shape?
A drop of water adopts a spherical shape due to surface tension, which minimizes the surface area of the drop for a given volume. The cohesive forces between water molecules cause them to attract each other, resulting in a spherical shape that has the least surface area, making it energetically favorable.
Does capillary action defy gravity?
Capillary action does not defy gravity; it is a result of intermolecular forces, specifically adhesive forces between the liquid and a solid surface, which allow liquids to move against gravity in narrow spaces like tubes or porous materials. This phenomenon occurs because the adhesive forces between the liquid molecules and the solid surface are stronger than the cohesive forces between the liquid molecules themselves.
Why the surface of the mercury in a glass tube is con vex end that of water concave?
Mercury has a low adhesive force to glass, it would rather bond to itself than another surface. This tends to create a spherical surface on open mercuric faces. Balanced by gravity the hemisphere flattens and creates the slight convex shape observed.
Water beads up on wax paper because its cohesive forces are greater than the adhesive forces?
Yes, water beads up on wax paper because its cohesive forces are greater than the adhesive forces.
Does water bead up on wax paper because its cohesive forces are greater than its adhesive forces?
Yes.
Capillary rise is due to the action of adhesion . is it right or wrong?
If the shape of the meniscus is concave up then the cohesive forces are weaker than the adhesive forces. If the shape of the menicus is concave down then the adhesive forces are weaker than the cohesive forces. So capillary rise is where adhesive forces are stronger.
Why is water rise in capillary tube wheras mercury falls in capillary tube?
This happens due to the difference in adhesive and cohesive forces. Water molecules are more attracted to the walls of the tube (adhesive forces) than to each other (cohesive forces), causing water to rise. Mercury has stronger cohesive forces compared to adhesive forces, so mercury is more attracted to itself than to the walls of the tube, causing it to be depressed or fall in the capillary tube.
Why does water drop spread on glass surface while mercury does not?
Water has stronger adhesive forces than adhesive forses. Mercury on the other hand has stronger cohesive forces than adhesive. cohesive forces hold molecules of the same substance together , vice-versa for adhesive forces
Mercury has its meniscus upward?
If the meniscus of mercury in a glass tube is curved upwards, it indicates that the adhesive forces between mercury and the glass are stronger than the cohesive forces within the mercury. This is due to the high cohesion and adhesive properties of mercury.
Why does water wet glass and mercury does not?
Water wets glass because the force of adhesion between the glass molecules and water molecules is greater than the force of cohesion between the water molecules and glass molecules. Mercury does not wet glass because the force of cohesion is greater than the force of adhesion
What cause capillary action?
There are following forces- Adhesive force between solid-liquid interface Cohesive force of liquids (consider water-oil system in a glass tube) The adhesive force between water and tube is greater than that of oil and tube because water is wetting fluid here. The surface tension of water is larger than that of oil. This imbalance in forces across the water-oil interface cause the upward motion of interface
2 How can you explain Cohesion and adhesion in term of water molecules?
Water has both cohesive and adhesive forces. They are similar.The cohesive of water describes how the molecules of water are attracted to one another. We observe the cohesive forces of water when we see a drop of water sitting on a surface. The water does not spread because the molecules are attracted to one another. Surface tension of water is due to its cohesive properties.The cohesive forces of water are due to hydrogen bonding between molecules.Adhesive properties of water are how the molecules are attracted to other substances. We observe the adhesive forces of water when we see the edge of water in a glass is attracted up on the sides of the glass. This is most apparent when the diameter of the glass vessel is less than a centimetre. It is called a meniscus. Trees use this adhesive property of water to help suck water up from the ground. If the diameter of the glass is small enough, as in a glass capillary, the water will rise up the tube by itself due to adhesive forces.
Why mercury falls in capillary tube?
Mercury falls in a capillary tube due to the combination of capillary action and gravity. Capillary action is the tendency of a liquid to be drawn up into a narrow tube against the force of gravity. When the adhesive forces between the mercury and the walls of the capillary tube are greater than the cohesive forces within the mercury, the mercury will move downward in the tube.
Does a substance having strong cohesive forces form a convex meniscus and why?
A convex meniscus does indicate strong cohesion, and at least stronger cohesion than adhesion. This is because of physics. A cohesive substance naturally attempts to form a sphere. That's the easiest way to think about I suppose. The substance tries to move closer to move of the substance as best it can.
How do particles move in a glass of water?
I think you mean 'capillarity' which happens in very thin tubes because the adhesive forces between water and glass molecules is greater than the cohesive force between water molecules alone. In narrow tubes, this is enough to pull the liquid up the tube.
