Message board
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Finally, I decided to open a message board for all here.
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My first message to all here is: Happy New Year 2006!! 7 hours more to 2006!!
Enjoy the last few hours of 2005. Start everything afresh next year and be good. -
Hmm, is this a crap box?
Welcome to Science Forum Crapbox!!!
Happy New Year (still got a few hours though)
For this crapbox, there's only one rule: don't hurt others by flaming.
No closing of this crapbox (unless too many pages, which I doubt so)
Well, start crapping here!!!!
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ok.
will come in and support you all often if topics are interesting. -
What topic you interested?
We try and get info. -
How about the science behind fireworks??
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Wait ar
Still researching -
An aerial firework is normally formed as a shell that consists of four parts:
* Container - Usually pasted paper and string formed into a cylinder
* Stars - Spheres, cubes or cylinders of a sparkler-like composition
* Bursting charge - Firecracker-like charge at the center of the shell
* Fuse - Provides a time delay so the shell explodes at the right altitude
Located just below the shell is a small cylinder that contains the lifting charge.
- These are small shells, about the size of a peach, that you can buy at roadside stands in some states. The sphere is the shell, and the small cylinder below is the lifting charge that shoots it out of the launch tube. The green fuse lights the lifting charge, which in turn lights the shell's fuse. Shells that you see at a show are typically the size of a cantaloupe or even larger.
The shell is launched from a mortar. The mortar might be a short, steel pipe with a lifting charge of black powder that explodes in the pipe to launch the shell. When the lifting charge fires to launch the shell, it lights the shell's fuse. The shell's fuse burns while the shell rises to its correct altitude, and then ignites the bursting charge so it explodes.
Simple shells consist of a paper tube filled with stars and black powder. Stars come in all shapes and sizes, but you can imagine a simple star as something like sparkler compound formed into a ball the size of a pea or a dime. The stars are poured into the tube and then surrounded by black powder. When the fuse burns into the shell, it ignites the bursting charge, causing the shell to explode. The explosion ignites the outside of the stars, which begin to burn with bright showers of sparks. Since the explosion throws the stars in all directions, you get the huge sphere of sparkling light that is so familiar at fireworks displays.
--> From HowStuffWorks -
Multibreak Shells
More complicated shells burst in two or three phases. Shells like this are called multibreak shells. They may contain stars of different colors and compositions to create softer or brighter light, more or less sparks, etc. Some shells contain explosives designed to crackle in the sky, or whistles that explode outward with the stars.
Multibreak shells may consist of a shell filled with other shells, or they may have multiple sections without using additional shells. The sections of a multibreak shell are ignited by different fuses. The bursting of one section ignites the next. The shells must be assembled in such a way that each section explodes in sequence to produce a distinct separate effect. The explosives that break the sections apart are called break charges.
The pattern that an aerial shell paints in the sky depends on the arrangement of star pellets inside the shell. For example, if the pellets are equally spaced in a circle, with black powder inside the circle, you will see an aerial display of smaller star explosions equally spaced in a circle. To create a specific figure in the sky, you create an outline of the figure in star pellets, surround them as a group with a layer of break charge to separate them simultaneously from the rest of the contents of the shell, and place explosive charges inside those pellets to blow them outward into a large figure. Each charge has to be ignited at exactly the right time or the whole thing is spoiled.
Fireworks technicians prepare for an aerial fireworks show.
--> From HowStuffWorks -
Interesting......... hmm....wonder if the black powder flying around is the main cause of accident fireworks explosion
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Red: Strontium and lithium
Orange: Calcium
Gold: Incandescence of iron, charcoal or lampblack
Yellow: Sodium
White: Magnesium or aluminum
Green: Barium plus a chlorine producer
Blue: Copper plus a chlorine producer
Purple: Strontium plus copper
Silver: Aluminum, titanium or magnesium powder or flakes
Note that all these metals when in pure forms can't give you fireworks. They will work in compound forms, especially when mix it with acid. -
Wow, this is really interesting.Originally posted by ndmmxiaomayi:Red: Strontium and lithium
Orange: Calcium
Gold: Incandescence of iron, charcoal or lampblack
Yellow: Sodium
White: Magnesium or aluminum
Green: Barium plus a chlorine producer
Blue: Copper plus a chlorine producer
Purple: Strontium plus copper
Silver: Aluminum, titanium or magnesium powder or flakes
Note that all these metals when in pure forms can't give you fireworks. They will work in compound forms, especially when mix it with acid.
Charcoal really orh kim -
Yes, the black powder flying around is the main cause of accident fireworks explosion. That's because powder have a smaller surface area and one spark is enough to cause an explosion. Not to mention that they are meant to be chemically explosive.Originally posted by The man who was death:Interesting......... hmm....wonder if the black powder flying around is the main cause of accident fireworks explosion -
hahaOriginally posted by The man who was death:Wow, this is really interesting.
Charcoal really orh kim -
i know my chemistry.Originally posted by ndmmxiaomayi:Yes, the black powder flying around is the main cause of accident fireworks explosion. That's because powder have a smaller surface area and one spark is enough to cause an explosion. Not to mention that they are meant to be chemically explosive. as long as there's small particles flying around in a enclosed space, a little spark is able to cause a big explosion -
Good good. So don't need to explain too much.Originally posted by The man who was death:i know my chemistry. as long as there's small particles flying around in a enclosed space, a little spark is able to cause a big explosion -
So quiet in Science forum...
No science questions? So good ar? sgforums like got a lot of science pros. -
Looks like the other moderators all disappear. Only ndmmxiaomayi left to mend this forum. Where is the rest?
I also MIA .
... Will pop in occassionally de... 
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hi
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Because I am the only one who goes to school without books but laptop. RP paperless campus ma. So once I am free, I will maintain this forum.
Mr Rat is looking for Mrs Rat, so I don't think he will be here any time sooner
Pitot like disappeared...
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i am here, for now.
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someone explain E = m c^2 to people
all i got are death threats by laurence when i tried -
check this website outOriginally posted by the Bear:someone explain E = m c^2 to people
all i got are death threats by laurence when i tried
http://en.wikipedia.org/wiki/Einstein
Einstein's third paper that year, "On the Electrodynamics of Moving Bodies" ("Zur Elektrodynamik bewegter Körper"), was published in September 1905. This paper introduced the special theory of relativity, a theory of time, distance, mass and energy which was consistent with electromagnetism, but omitted the force of gravity. While developing this paper, Einstein wrote to Mileva about "our work on relative motion", and this has led some to ask whether Mileva played a part in its development. Some believe that Einstein and his wife were both aware of Henri Poincare's publishing of Relativity just a few weeks before Einstein. [See Henri Poincare and also http://www.xtxinc.com] However, his colleagues would say that he "thought much and read little."
A fourth paper, "Does the Inertia of a Body Depend Upon Its Energy Content?", ("Ist die Trägheit eines Körpers von seinem Energieinhalt abhängig?") published late in 1905, showed one further deduction from relativity's axioms, the famous equation that the energy of a body at rest (E) equals its mass (m) times the speed of light (c) squared: E = mc2 . -
aha...
therein is where moving mass increases relative to its rest mass as velocity increases towards c
which is why there is a theory that anything with mass can never reach the speed of light because mass would near infinity as the thing is accelerated towards c...
the energy necessary would become infinite too...
or something like that -
Yes, it is like what you explained.Originally posted by the Bear:aha...
therein is where moving mass increases relative to its rest mass as velocity increases towards c
which is why there is a theory that anything with mass can never reach the speed of light because mass would near infinity as the thing is accelerated towards c...
the energy necessary would become infinite too...
or something like that