Question

Why does a firecracker explode?

Answer 1

this is the answer of this question

Answer 2

The source of most fireworks is a small

tube called an aerial shell that contains

explosive chemicals. All the lights, colors,

and sounds of a firework come from these

chemicals.

An aerial shell is made of gunpowder, which

is a well-known explosive, and small globs of

explosive materials called stars . The

stars give fireworks

their color when they

explode. When we

watch fireworks, we

actually see the explosion of the stars. They

are formed into spheres,

cubes, or cylinders that

are usually 3–4 centimeters (1–1½ inch) in

diameter.

Figure 1. Structure of

an aerial shell. The

black balls are the stars,

and the gray area is

gunpowder. The stars

and the powder are

surrounding a bursting

charge, which also

contains black powder.

Each star contains four chemical

ingredients: an oxidizing agent, a fuel,

a metal-containing colorant, and a

binder. In the presence of a flame or

a spark, the oxidizing agent and the

fuel are involved in chemical reactions

that create intense heat and gas. The

metal-containing colorant produces the

color, and the binder holds together the

oxidizing agent, fuel, and colorants.

At the center of the shell is a bursting

charge with a fuse on top. Igniting the

fuse with a flame or a spark triggers the

explosion of the bursting charge and of

the entire aerial shell.

How fireworks

explode

The explosion of a firework happens

in two steps: The aerial shell is shot into

the air, and then it explodes in the air,

many feet above the ground.

To propel the aerial shell into the

air, the shell is placed inside a tube,

called a mortar, which is often partially

buried in sand or dirt. A lifting charge

of gunpowder is present below the shell

with a fuse attached to it. When this

fuse, called a fast-acting fuse, is ignited

with a flame or a spark, the gunpowder

explodes, creating lots of heat and gas that

cause a buildup of pressure beneath the shell.

Then, when the pressure is great enough, the

shell shoots up into the sky.

After a few seconds, when the aerial shell is

high above the ground, another fuse inside the

aerial shell, called a time-delay fuse, ignites,

causing the bursting charge to explode. This,

in turn, ignites the black powder and the stars,

which rapidly produce lots of gas and heat,

causing the shell to burst open, propelling the

stars in every direction.

During the explosion, not only

are the gases produced quickly, but

they are also hot, and they expand

rapidly, according to Charles’ Law, which

states that as the temperature of enclosed

gas increases, the volume increases, if the

pressure is constant . The loud boom

that accompanies fireworks is actually a sonic

boom produced by the expansion of the gases

at a rate faster than the speed of sound!

If the stars are arranged randomly in the

aerial shell, they will spread evenly in the sky

after the shell explodes. But if the stars are

packed carefully in predetermined patterns,

then the firework has a specific shape—such

as a willow, a peony, or a spinner—because

the stars are sent in specific directions during

the explosion.

The timing of the two fuses is important.

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