Why is mercury used in U tube manometer?

Why is mercury used in U tube manometer?

The manometer is a wet meter which means that the fluid whose pressure is being measured is brought in contact with another fluid, for example mercury, which is displaced to indicate the pressure. Mercury can be used because it has a high density and so the manometer size is minimised.

Why mercury is widely used for the liquid in the U tube manometer instead of using water?

The tube is sealed during manufacture with the sealed end containing a vacuum. Mercury is a useful material to use in a manometer because of its high density. This means that a much shorter column is needed compared to water.

Why is mercury manometer better than water manometer?

why mercury is used in manometer instead of water? Mercury has high density and low length is essential for pressure measuring. Its high density helps to make small manometers. It does not evaporate like water would, and its lower freezing point means it will not freeze up at 0 deg C.

What is mercury manometer?

A mercury manometer is a vertical glass or plastic tube filled with liquid mercury that is used to measure the pressure of gases. Open-end manometers measure the pressure difference between the gas being sampled and the room air.

Why Mercury does not stick to the wall of manometer?

Cohesive force of mercury is greater than adhesive force brtween mercury and glass (of the walls of capillary). That is why mercury do not stick to glass.

Why mercury is not used in manometer?

it does not stick on the tube walls of manometer, resulting an accurate measurements. Mercury has high density and low length is essential for pressure measuring. Its high density helps to make small manometers. It does not evaporate like water would, and its lower freezing point means it will not freeze up at 0 deg C.

Why is water not used as barometric liquid?

Water is not a suitable barometric liquid because: Water barometer will support 10.4m of water at sea level. It is impractical to have such a long tube.

What liquid is used in manometer?

mercury

Why water is not used in barometers instead of mercury?

That is, if water is used in barometer tube instead of mercury, the length of the tube must be greater than 10.326 cm. A greater height will be difficult to hold in a vertical position and needs a high tower to install the barometer. So, we cannot replace mercury by water in the barometer.

What are the advantages of using mercury as a barometric liquid?

The advantages of use of mercury in a barometer are :

• its density is very high.
• it has low vapour pressure.
• its rate of evaporation is not very high.
• it neither wets nor sticks to glass.
• its surface is shining and opaque.

Can water be used as a barometric liquid?

Water is not used as a barometric liquid because.

How do you change the density of mercury?

although to be particular, it will slightly increase (the particles move slightly farther apart while maintaining the same mass, though the intermolecular forces hold it together well). where m is mass and D is density. One can see then that the slight increase in volume decreases the density slightly.

What liquid is more dense than mercury?

Americium, another actinide element, is slightly denser than mercury at 13.84 grams per cubic centimeter.

Which metal has the highest density?

Osmium

What is the hardest metal on the planet?

The Hardest Metals in the World

1. Tungsten (1960–2450 MPa) Tungsten is one of the hardest metals you will find in nature.
2. Iridium (1670 MPa)
3. Steel.
4. Osmium (3920–4000 MPa)
5. Chromium (687-6500 MPa)
6. Titanium (716 to 2770 MPa)