Name: 【歡慶2015】亮麗煙火背後的化學小知識 (The Chemistry of Fireworks - Reactions)
Uploaded: 2014-12-31T16:08:53.000Z
Duration: 6 min 32 s
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Washington College in Chestertown Maryland.

I wrote a textbook, "The Chemistry of Pyrotechnics: Basic Principles and Theory."

Every pyrotechnic composition has at least

one chemical that's oxygen-rich an oxidizer:

Potassium nitrate used to make black powder.

Strontium nitrate is an oxygen-rich chemical,

Then you need a fuel that's gonna combined

The fuels are things like sulfur, charcoal,

aluminum powder, magnesium powder, you vary

This is an aerial shell, this is what people

The bottom has a little pocket of black powder,

There's a very important time fuse that goes

from the propellant into the center of the casing.

marble sized pellets of chemical mixture,

that will produce different colors different

visual effects when the shell burst open.

So this device is placed in a mortar tube,

a fuse or it's gonna be electrically fired

And then 3,4,5 seconds later, depending on how

high you wanted to go burns into the center in

the shell, light that gunpowder bursting charge,

in the sky and you see the beautiful colors,

the sparks, all the effects, the patterns

that have been engineered into the device.

Calcium makes a nice yellow orange here’s

a calcium nitrate or the calcium carbonate.

If we want a grain color we need some kind

of a barium compound, this is barium acetate.

You look for chemicals that don't strongly

Now the glasses I'm wearing are polycarbonate

lenses, which are shatter resistant, but when

I'm around energetic chemicals I always wear

the extra protection of goggles or side shades.

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【歡慶2015】亮麗煙火背後的化學小知識 (The Chemistry of Fireworks - Reactions)

specific

fuel

produce

device