Why mercury goes down when capillary tube is dipped in mercury?

The intramolecular attractions between the mercury molecules are much higher. So the mercury molecules do not stick to the glass walls of the capillary tube and due to the effect of gravity, those molecules appear to fall down.

Why does mercury differ from water with regards to capillary?

Water is a liquid that wets glass capillary tubes; mercury is one that does not. The narrower the bore of the capillary tube, the higher the water rises. Mercury, conversely, is depressed to a greater degree, the narrower the bore.

Does the capillary rise occurs in mercury as well?

No, the capilary rise does not occurs in mercury. Mercury surface tension property is the reason for capilary fall on mercury. Water makes an acute angle of contact with glass, so it rises. But in contact with glass mercury makes an obtuse angle, so it falls in a capillary tube.

When a capillary tube is dipped in mercury the level of mercury?

When a capillary tube is dipped in water, water rises up to a height of 0.1 m inside the tube. If that capillary tube is dipped in mercury, then the mercury level falls down through 0.342 m.

What happened to the water level in the capillary tube?

Explanation: When a liquid wets the container walls, it causes capillary elevation – liquid level in the capillary is higher than the liquid level outside the capillary. Non-wetting liquids cause capillary depression – the liquid level drops below the level outside the capillary.

Why a capillary tube is put in a wider tube or a fusion tube?

The adhesive forces are proportional to the diameter of the tube while the gravitational effect due to the liquid’s weight is proportional to the square of the diameter. This results in the greater height of the meniscus for narrower tubes.

When a glass capillary is dipped vertically in a mercury tank the mercury level in the capillary?

mercury level rises in tube.

When a capillary tube is dipped into a tub?

When a capillary tube is dipped in a liquid, the liquid rises to a height h in the tube. The free liquid surface inside the tube is hemispherical in shape.

Why does a capillary fringe form right above the water table?

The capillary fringe is the subsurface layer in which groundwater seeps up from a water table by capillary action to fill pores. Pores at the base of the capillary fringe are filled with water due to tension saturation. Others define the capillary fringe as including both the tension-saturated and unsaturated portions.

What are various parameters that define the rise or fall of liquid in capillary?

Capillary rise of liquid in a capillary is the liquid-air surface tension (force/unit length), θ is the contact angle, ρ is the density of liquid (mass/volume), g is the local acceleration due to gravity (length/square of time), and r is the radius of tube.

What happens when a capillary tube is immersed in liquid?

If the tube is immersed in a liquid which does not wet the glass (mercury), then the liquid level inside the tube decreases. This phenomenon of the rise or fall of liquid in a capillary tube is called capillary action or capillarity.

Why does Mercury not stick to a capillary tube?

As mercury is more dense then the water,the force of attraction between its particles is more hence, the adhesive force (between its particle)is more so it doesn’t attracts to the tube and fall but water has more cohesive force with capillary tube and hence following its force with the particles…

What happens when a glass tube is immersed in Mercury?

When a glass tube is immersed in mercury, the level of mercury inside the tube falls below the level in the outer vessel. Examples of capillarity: Blotting paper absorbs ink or water, ink rises in a pen, oil rises in wicks of a lamp. Chalk is porous in nature. In these pores, the air is trapped.

What determines the rise or fall of liquid in a capillary?

Engg ) Mathematics & Physics, Orrisa University of Agriculture & Technology, Bhubaneswar (1993) The rise or fall of liquid in a capillary depends on the angle of contact of the liquid with the glass material of the tube.