Why flame tends to glow upward?
461222
its not just that "heat rises", but that things with lower densities rise above things with higher densities. ice floats in water, helium floats in air, etc.  heat is not an object that can rises, but it is an attribute of particles that affects their density. just like hot air rises, when a flame burns, it produces hot gases that rise. these gases are hot enough to produce light, so we see the light rising with the gases. by the time they have risen above the flame, they are no longer hot enough to give off light, so the flame doesn't go up forever.
337135
It is because of the air bending the light slightly. Its the same as shining a light through water, but the effects are less pronounced.
818868
I suspect this refers to how flourescent light bulbs generate a quasi-continuous spectrum as opposed to the discrete emission lines like other self respecting plasma discharge tubes.  \n\nHere is a website that has several pages on Flourescent Lamps:\n\nhttp://home.howstuffworks.com/fluorescent-lamp.htm\n\nThe first two or three are the ones useful to you.  Also there are several links on the last page under More Great Links that will help you in your researches.  Happy hunting!\n\nBTW: This reeks of an intro science class lab write-up question.  TAs at help desks or profs during office hours can help a great deal more effectively than something like yahoo answers, if you want to truly understand.
479037
because all a flame is is particles of whatever is burning giving off energy in the form of electrmagnetic radiation, namely light. Different compounds and elements give off different wavelengths of light when heated hence the color of the flame.
90654
Because the heat of the lamp might be enough to ignite the fuel.
131039
Alcohol has a low flash point and burns with a near invisible flame.  It would be easy to start an uncontrolled flame that would be difficult to see.  All of which could lead to disasterous results.
979836
All elemets will give of colors when excited enough. Some take extremely high energy. Elements can be idntified by these colors. Some elements give off their colors easily, such as the metals in column 1 and 2 and copper. When placed in a flame the outer electrons jump to a higher energy level and when they fall back they fall a specific distance or wavelength. . We see it as the color we perceive.
112405
It is evidently the chrome, etc. covering of plastic parts to make them gleam bright.  It may start with non-electrolytic coating(s) that can then be electroplated.
1088644
As a candle burns, it gives off molecules in the form of gases. Those molecules are in a very excited state, causing a breakdown of the chemical bonds that bind them together. This releases energy which you see as both light and heat from the flame. In other words, the flame is simply a column of very excited gases.
165350
wattage of the bulb is important...prob not generating enough heat to make the 'lava' flow (wax).\n\nIt should show signs of flow within an hour...at least!
899400
zone?  luminous flame?\n\nwhat's the question?????
393843
b/c a constant amt. of electricity is going into it, and it will only get brighter if you add more electricity to it, or get a brighter bulb!
143411
This IS related to gravity.  Hot air rises because it is less dense (and therefore weighs less).  This is not true in zero gravity.  If you search NASA's website, you will find pictures of candles burning in 0g.  They are perfectly round.
876351
When something burns the vapor given of by the reaction between the fuel, oxygen and heat is what is actually burning.  The flame goes up because this vapor is less dense than the surrounding air.
795573
I have often seen them. The moon light will show upper atmospheric pollution that may be caused by large fires,this was a banner year for brush fires.  As I write a large Volcano in Italy is spewing ash. In short anything that would give off a significant amount of pollution.  if you remember the date it was, go to the library and research the newspapers for calamities on that date. A fine mist can magnify the moons light.  I remember seeing pollution rainbows from the oil wells that were set burning in freeing Kuwait from Iraq.
776710
they make colors usually white stand out more. if you have glow in the dark stuff it will make that stand out too
17005
Stars seem to "twinkle " because of heat waves in the atmosphere .  They twinkle less in cold weather than in warm .