Sodium vapour.
I think it's sodium.
Sodium (chem symbol = Na) Mercury vapor is also used in street lights. Low pressure sodium vapor street lights are amber/yellow in color, high pressure sodium lights are white and mercury vapor lights glow blueish white.
No, the light producing quartz arc tube is totally enclosed in a borosilicate glass envelope which contains nitrogen gas. This is a completely sealed unit so no vapours are released.
yes
Yes many people believe that metal halide street lights are environment friendly. Here are some sites about these lights. www.fairfaxcounty.gov news releases 2009 , enduraliteled.ca/municipal
Depends on the color: yellow-orange is surely sodium light, bright blueish can be xenon, krypton or mercury light. The color of LED-light is differently 'made'.
Yes you can get more information on line about metal halide lights at the following sites. Here are some sites you can look at www.eskimo.com/~jrterry/lampspage.html
Boiling point: the temperature when vapours of the material are formed.
Mercury. The metal gives off poisonous vapours - and has largely been replaced by alcohol.
Try heating the super glue with a propane torch. Keep away from the vapours.
The light elements of street lights typically include LED (light-emitting diode) bulbs, which are favored for their energy efficiency, longevity, and brightness. Some street lights may also use high-pressure sodium (HPS) or metal halide bulbs, which provide strong illumination but are less energy-efficient than LEDs. Additionally, street lights often incorporate reflectors and lenses to optimize light distribution and minimize glare. Overall, the choice of light element impacts visibility, energy consumption, and maintenance needs.
there is no yellow pure metal