How firecrackers work?
consist of black powder or gunpowder, which is placed in a tight paper
tube with a fuse. The black powder contains charcoal, sulphur and
potassium nitrate. Sometimes aluminum is added instead of charcoal to
brighten the explosion.
Sparklers burn longer
to produce a bright and showery light. They consist of fuel
(charcoal and sulphur), oxidiser (aluminum per chlorate or barium
nitrate plus aluminum per chlorate), iron or steel powder and a
binder (sugar or starch). Mixed with water, these are coated on a
wire. Once dried, sparklers are formed that burn from one end to
another when lit. The fuel and oxidizer make it burn slowly rather
than explode like a firecracker. A variety of chemicals can be added
to produce colours.
An aerial firework
consists of a cylinder-shaped container, which is made of paper, a
string, star-shaped sparkler material, black powder and a fuse. This
container or shell is launched from a mortar tube. The black powder
explodes in the tube to launch the shell. The fuse burns and the
shell rises to an optimum altitude. Then the fuse ignites the
contents of the shell, which then gets exploded. The explosion
ignites the outer surface of stars, throwing around a bright shower
We should only use
those crackers that produce 125 db or less of sound. Chemicals
contained in crackers may produce toxic gases, which can cause a
variety of respiratory diseases. UV light from crackers are harmful
to eyes and carbon monoxide negatively effects the haemoglobin
content in the blood.
— Compiled by Gaurav