In which industry used potassium nitrate?

Answer 1

Potassium nitrate is used in fertilisers as a nitrate source, sometimes in food as a preservative (although other nitrates work better and are used more often), in ice cream making, in toothpastes for sensitive teeth, and in fireworks and some explosives as an oxidant for the fuel.

http://en.wikipedia.org/wiki/Potassium_nitrate

Answer 2

It's usually useful for making smoke bomb compositions with sugar if you have it domestically. It can also oxidize other fuels.

In the lab, it is used in many chemical reactions that would have to depend on what you want to do.

Answer 3

It has a variety of uses in the fireworks/explosives and fertilizer industry. It is also used in the use of making matches, glass manufacturing, Metallurgy.

Answer 4

It is used in black/gunpowder (if you have it in your house).