Which metal is used in mercury Vapour lamp?

Which metal is used in mercury Vapour lamp?

Mercury Vapor Lamps Mercury (Hg) is the only elementary metal which has a substantial vapor pressure at room temperature. Therefore, a lamp enclosing may in principle contain mercury only. However, some starter gas such as argon or xenon is often used. Low-pressure mercury vapor lamps are often used as spectral lamps.

What is a high-pressure mercury Vapour lamp?

High-pressure mercury gas-discharge lamp; High-pressure mercury-vapor lamp. Definition. Lamp that produces light as a result of an electrical discharge, generated between two electrodes, in a high-pressure mercury vapor that is contained in a transparent bulb.

How is mercury vapor made?

In order to extract mercury from its ores, cinnabar ore is crushed and heated to release the mercury as a vapor. The mercury vapor is then cooled, condensed, and collected. separate and capture any mercury, which may have formed compounds.

Which coating does mercury vapor lamp have?

phosphor
The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the light produces, and a convenient mounting for the fused quartz arc tube.

Which gas is used in sodium Vapour lamp?

Sodium-vapour lamp, electric discharge lamp using ionized sodium, used for street lighting and other illumination. A low-pressure sodium-vapour (LPS) lamp contains an inner discharge tube made of borosilicate glass that is fitted with metal electrodes and filled with neon and argon gas and a little metallic sodium.

How is mercury used in street lights?

Mercury is used in a variety of light bulbs. Mercury is useful in lighting because it contributes to the bulbs’ efficient operation and life expectancy. Fluorescent and other mercury-added bulbs are generally more energy efficient and last longer than incandescent and other equivalent forms of lighting.

How does a high pressure mercury lamp work?

Fluorescent high-pressure mercury lamp uses an extra layer of phosphor powder on the shell to convert invisible light into visible light, which improves the light efficiency and makes the light brighter. It is most suitable for outdoor, street, factory and other open places.

Why is the mercury Vapour at low pressure?

The initial high voltage burst is necessary to produce electrons with enough kinetic eergy to ionise the mercury atoms – the atoms in the gas need to be sparse enough (low pressure) so that KE can be built up to a level that will allow ionisation of the mercury atoms.

What happens if you breathe in mercury vapor?

The inhalation of mercury vapour can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. The inorganic salts of mercury are corrosive to the skin, eyes and gastrointestinal tract, and may induce kidney toxicity if ingested.

Can you touch mercury?

Mercury is a very toxic or poisonous substance that people can be exposed to in several ways. If it is swallowed, like from a broken thermometer, it mostly passes through your body and very little is absorbed. If you touch it, a small amount may pass through your skin, but not usually enough to harm you.

Why is mercury used in street lights?

How many types of mercury Vapour lamps are there?

The bulbs have an inner quartz tube containing the mercury vapor discharge. This is enclosed by an outer glass bulb that filters out harmful short-wavelength ultraviolet (UV) radiation. There are two types of mercury vapor light bulbs sold in the U.S.

What kind of light does a mercury vapor lamp produce?

vaporized mercury in a high pressure tube to create very bright light directly from it’s own arc. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates UV light to excite the phosphors. The “Merc” as it is known

What makes a high pressure mercury lamp work?

The center discharge tube of the high-pressure mercury lamp is made of quartz glass. The tube is filled with mercury and argon. The main motor pole is made of tungsten and filled with alkaline earth metal oxide electron-emitting substances.

When did they start using mercury in lamps?

These early low pressure lamps used a lot of mercury, today’s lamps use a tiny amount of mercury. Right around 1900 the mercury arc rectifier was developed, this luminous device was very important for power conversion.

How is a vapor lamp different from a fluorescent lamp?

vapor lamp is a high intensity discharge lamp. It uses an arc through vaporized mercury in a high pressure tube to create very bright light directly from it’s own arc. This is different from fluorescents which use the mercury vapor arc to create a weaker light that mainly creates