Should the top of the capillary tube be open or closed?

The tube should be drawn so it is open at the top and not closed! A: You are totally right in observing that there will be some air trapped within the tube if you simply dip an inverted tube into water.

What happens when capillary tube is cut?

The water will never overflow . if the tube is of insufficient length , the radius of curvature of the liquid meniscus goes on increasing , making it more and more float till water is in equilibrium.

What will happen to the drop of fluid in the capillary tube over the next few hours?

As we know that the rise of liquid in capillary tube is due to the surface tension and it is opposed by the downward force exerted by the compressed air above liquid in the tube. Therefore there will be small rise in liquid column if the top of capillary tube is closed.

How is the rise of liquid affected if top of the capillary is closed?

If the top of the capillary tube is closed, the liquid will rise to lesser height as compared to ordinary condition. This is because the air gets compressed and the pressure will increase. Thus, the top end of the tube being closed will affect the rise of a liquid.

Why the empty space in the capillary tube must be a vacuum?

The top of the barometer is filled with nothing (vacuum) because the mercury must have the space to expand and contract without any other force affecting it; a gas or liquid in the top would have its own pressure against the mercury and give inaccurate readings.

Why is the capillary tube placed such that the open end is above the oil level?

The shape of the Thiele tube allows for formation of convection currents in the oil when it is heated. It is important that this rubber band be above the level of the oil (allowing for expansion of the oil on heating). Otherwise, the oil softens the rubber and allows the capillary tubing to fall into the oil.

Why Thiel’s tube is used give reason?

The Thiele tube, named after the German chemist Johannes Thiele, is a laboratory glassware designed to contain and heat an oil bath. Such a setup is commonly used in the determination of the melting point of a substance. The apparatus itself resembles a glass test tube with an attached handle.

What will happen if length of capillary tube is smaller than the height to which the liquid rise explain briefly?

When length of tube is less than the height of capillary rise, the liquid molecules on reaching top of the capillary come into contact with horizontal surface of the tube. The surface tension becomes horizontal. There is no vertical force to pull the liquid up and it stops rising.

What happens in the capillary rise of a liquid when the radius of the capillary tube increases?

If ‘r’ is the radius of the bore of the capillary tube, the length along which the force of surface tension acts is 2πr. Due to this force the liquid rise up in the tube. The liquid goes on rising till the force of surface tension is balanced by the weight of the liquid column.

Why the drop of water in the capillary tube does not fall?

When wetting does not occur, capillarity does not occur. Capillarity is the result of surface, or interfacial, forces. The rise of water in a thin tube inserted in water is caused by forces of attraction between the molecules of water and the glass walls and among the molecules of water themselves.

What shape does a liquid take when it weighs nothing give reason to support your answer?

Answer: When a liquid weighs nothing, surface tension is the only force acting on it. Due to surface tension, the liquid surface tends to occupy minimum surface area. For a given volume, the surface area of a sphere is minimum, so the liquid assumes spherical shape.

What happens when you capillary dip an empty tube in water?

Dip an empty tube with closed end into water, trapping some air inside. Due to the counteracting air pressure, there will be some rise in water due to capillary action but less than in case 2. But the equilibrium level will be different than the initial level. Follow-up on this answer.

What is the length of the air column in a capillary tube?

A uniform capillary tube closed at one end contained dry air trapped by a thread of mercury 8.5×10^-2m long.When the tube was held horizontally the length of the air column was 5×10^-2m,when it was held vertically with the

What happens when you dip an inverted tube in water?

You are totally right in observing that there will be some air trapped within the tube if you simply dip an inverted tube into water. It is also absolutely correct that as the water level rises, there will be some compression of the air, hence an increase in its pressure.