in the laboratory, you are reminded not to refill a hot alcohol lamps.explain the reason for this precaution?
111568
It is because the alchol lamps remain hot for some time even after they are removed from the flame.  So as alcohol is a combustible substance, you are advised not to refill the lamp as they catch fire.
613982
Old fluorescent tubes, which required a ballast to start, used a bunch of electricity to turn on - but a small amount of electricity to keep them on. So it was more economical to leave them on rather than turn them off for a few hours.\nImprovements in design have eliminated that anomaly and there is now little difference in the power needs to start and maintain the bulb.
163519
The electrical contact for the bulb is on the very tip of the screw, and water is kept from reaching it by the screws themselves.  You can tell when you screw it in that it's a tight fit.  Additionally, the glass is sealed to the metal, so that moisture and particulates can't get inside to the filament.
89866
air is not necessary for a lightbulb to burn. but due to the zero atmosphere it would most likely explode unless encased in a pressurized vessel.
521723
to avoid the configeration damage
661934
http://www.ask.com/web?q=why+is+it+important+to+avoid+contact+of+KMnO4+and+ethanol%3F+&qsrc=0&o=0
787094
OSHA prohibits giving miners alcohol prior to or during their shifts due to the hazardous nature of their jobs. Plying them with alcohol after their shifts is allowed however, and has led to more than one foreman getting lucky with the younger, less experienced drinkers on his crew.
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.
74731
The gas mixture within the latest halogen lamps is designet to interact with the tungsten that is vaporized from the burning filament so that it will not coat the interior of the lamp glass, which wpi;d otherwise dim the bulb, thus extending its lifetime.  It can also be used to affect the spectrum of  the emitted light, with differing gas mixtures altering the emission spectrum.
874660
This is sort of a guess, so you may wish to verify it for sure.  I know, for sure alcohol, has a much lower freezing point.  So if you put cells in a 50% alcohol solution, the cells would require a lower temperature for freezing.  \n\nYour question is not about freezing cells Per Se, so maybe this extra tidbit will be more helpful:  \n\nI have put cells in 70% alcohol solution and maintained them in a freezer.  I did this because I wanted to preserve the antigens present on the cell membrane.  I believe you would have to do this for an hour or so, in order for best preservation.  But you would probably need to use the cells in the follow-up assay (for me it was flow cytometry) within a 24 hour period.\n\nWhen I have deep freezed cells for long term storage, I did it in DMSO.  That's the standard method.\n\nIn short, keeping cells in 70% ethanol will preserve antigen found on cell surface membrane.\n\nI wish I could speak for chloroform, but nowadays people rarely use it due to its high toxicity and high flash point. \n\nHope this helps.
891018
The white powder is a preservative.  Doesn't have anything to do with your blood alcohol.\n\nThere's no amount they're "supposed" to draw, but there is a minimum amount that has to be drawn to provide the lab with a sufficient amount to test and have enough left over for the defense to have re-tested.  What that amount is will vary by state law, lab policy and maybe even prosecutor's policy.
79503
if you drink....DON'T DRIVE. \n\nsimple as that.
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.
13873
I can't stand it when people leave a room without turning the lights off. I usually dash back inside the room after the person leaves, to correct the problem. I'm not like that with most things but...
1059851
The fact that no oxygen is present in a light bulb protects it
67424
if the fluid is red than it is alcohol. if the fluid is silver than it mercury. either way you probably did not get enough in your blood to hurt you. If you are still concerned contact poison control or a doctor.
335661
you shouldn't drink with any antibotic