Explosive & Fire Cracker
Explosive
These are the substances that contain a great amount of stored energy that can produce an explosion. A sudden expansion of the materials after initiation leads to the production of light, heat, sound, and pressure. A chemical explosive may consist of either a chemically pure compound, such as nitroglycerine or a mixture of a fuel and an oxidiser.
Fire Cracker
A fire cracker is a small explosive device primarily designed lo produce a large amount of noise, especially in the form of a loud bang, any visual effect is incidental to this goal. Fire crackers are generally made up of card board or plastic with black powder as the propellant. Black powder or gun powder contains potassium nitrate (KNO3), charcoal, and sulphur. The entire fire cracker must be very tightly packed in order for it to work best.