Answer :
Final answer:
Low explosives burn or deflagrate at around 3300 feet per second or slower. This subsonic flame propagation is slower than that in high explosives, and it can be exemplified by the operation of a fireworks shell propelled high into the sky by a slow-burning low explosive mixture.
Explanation:
Low explosives, also known as deflagrating explosives, undergo combustion at a relatively slower rate compared to high explosives. When these explosives burn, they deflagrate at around 3300 feet per second or slower. The flame propagation in low explosives is subsonic, with the speed being less than the speed of sound in the material.
For instance, consider a fireworks display. When a shell is shot into the air, it's initially powered by a low explosive mixture. This mixture burns slowly enough that it propels the shell high into the sky, instead of instantly exploding. This careful balance is integral to the function of fireworks, and exemplifies the slower burn rate of low explosives.
To put it in perspective, supersonic (faster than sound) flame propagation, as seen in high explosives, occurs at speeds of 3600 feet per second or faster. Thus, the correct answer to your question is that low explosives burn or deflagrate at 3300 feet per second or slower.
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