What is the density of mercury vapor?

– Vapor Density of mercury is 6.9, which should mean that the mercury vapor is much heavier than air and toxic vapors should accumulate along the floor. – Density of air saturated with mercury vapor is 1.00 because its concentration is low.

What is the Vapour point of mercury?

Experimental Vapor Pressure Data More recently, the normal boiling point of mercury was determined by Beattie et al. [28] as (356.58 ± 0.0016) °C, on the 1927 International Temperature Scale. This measurement was selected as a secondary fixed point on the ITS-48 Temperature scale [29].

How many lumens is a mercury vapor light?

For example, a 175 watt mercury vapor puts out about 6,800 mean lumens while a 100 watt metal halide puts out 5,800 mean lumens. Even without considering the rapid lumen depreciation, MV uses 75% more energy to produce almost the same amount of light.

Can mercury be vaporized?

Liquid mercury vaporizes (evaporates) at room temperature causing elevated levels of mercury in indoor air. Mercury vapor is not irritating and has no odor, so people do not know when they are breathing it.

What is vapor density?

Vapor density is the weight of a volume of pure vapor or gas compared to an equal volume of dry air at the same temperature and pressure. It is obtained by dividing the molecular weight of the vapor by the average molecular weight of air thus, it is unitless.

What is the formula of Vapour density?

It may be defined as mass of a certain volume of a substance divided by mass of same volume of hydrogen. vapour density = mass of n molecules of gas / mass of n molecules of hydrogen. vapour density = molar mass of gas / molar mass of H2 vapour density = molar mass of gas / 2.016 vapour density = 1⁄2 × molar mass.

Do mercury vapor lamps need a ballast?

As with fluorescent lights, mercury vapor lamps require a ballast to supply the proper voltage and regulate the current to the electrodes. The ballast is designed to be used with a specific size, or wattage, of bulb.

What does a vapor density of 1.5 mean?

The relative weight of a gas or vapor compared to air, which has an arbitrary value of one. If a gas has a vapor density of less than one it will generally rise in air. If the vapor density is greater than one the gas will generally sink in air.

What is a mercury vapor lamp?

The mercury 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.

What is the density of mercury?

Density of Mercury is 13.534g/cm3. Typical densities of various substances are at atmospheric pressure. Density is defined as the mass per unit volume.

What is the difference between high-pressure and low-pressure mercury vapor lamps?

High-pressure mercury-vapor lamps are commonly used for general lighting purposes. They emit primarily in the blue and green. Low-pressure Hg lamps can be rather small, but efficient sources of deep UV light. Low-pressure mercury-vapor lamps usually have a quartz bulb in order to allow the transmission of short wavelength light.

How do mercury vapor light bulbs protect from UV radiation?

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. “T” type light bulbs have a self-extinguishing feature that shuts off the light within 15 minutes after the outer bulb is broken.