Which of the following is not classified as a high explosive?

Nitrocellulose is considered a low explosive rather than a high explosive. High explosives are characterized by their ability to detonate and produce a supersonic shockwave, often causing a rapid and violent reaction. Nitrocellulose, on the other hand, burns relatively slowly and does not create the same kind of explosive force, meaning it cannot sustain a detonation in the same way that high explosives like nitroglycerin, dynamite, or picric acid can.

Nitroglycerin, dynamite, and picric acid are all classified as high explosives because they can undergo detonation, generating intense pressure and heat very rapidly when triggered. This distinguishes them from nitrocellulose, which is often used as a propellant in firearms and other applications where a slower burning rate is advantageous. Understanding these classifications is crucial for safety and handling in any contexts involving explosives.