rachmaninoff said:Helium can diffuse through a thin glass wall, so it would escape from a light bulb (not very useful).
I did an experiment testing this last year. It turns out that effusion rates are proportional to molar mass (Graham's law?). If helium has a molar mass of something like 4 and krypton is way way up there in terms of mass, that's a considerable difference.Facial said:I suppose, then, that it can probably diffuse through a thick glass wall, but I'll have to look that up sometime with regards as to how much slower.
ShawnD said:Does helium cost more than argon or krypton?
These gases are used as fillers in the bulb to prevent the filament from burning out too quickly. They help to regulate the temperature inside the bulb and keep the filament burning at a consistent rate.
Argon is the most commonly used gas because it is inexpensive and readily available. It also has a high thermal conductivity, making it effective at regulating the temperature inside the bulb.
Yes, there are slight differences. Helium is the most effective at increasing the lifespan of the bulb, while krypton is better at producing a brighter and whiter light. Neon is often used in colored bulbs for decorative purposes.
These gases do not directly affect the energy efficiency of incandescent bulbs. However, they do help to regulate the temperature inside the bulb, which can impact the overall lifespan and energy usage of the bulb.
One potential drawback is that these gases are not as effective as other methods, such as LED technology, in improving the energy efficiency of bulbs. Additionally, some of these gases, like krypton and neon, are more expensive than argon, which could impact the cost of the bulbs.