What causes Nitroglycerin to detonate while thawing?

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Nitroglycerin, a highly sensitive explosive, poses significant risks during transport, particularly when frozen. The primary concern is that upon thawing, if the nitroglycerin cracks, it can detonate due to its shock sensitivity. The process of freezing and thawing can create internal stresses in the material, leading to cracks. When these cracks occur, they can trigger a detonation, similar to how an ice cube may crack when held in a warm hand. Understanding these properties highlights the dangers associated with handling nitroglycerin, especially in its frozen state.
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While reading about Nitroglycerin a number of time I've read that it used to be frozen for transport but upon thawing it would detonate. What causes this to happen? It it expansion of the liquid as it heats up creating pressure? I have absolutely no intention or would ever consider making/buying/freezing nitroglycerin, I'm just curious.
 
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If it cracks while thawing, the shock sensitive material can detonate. Take an ice cube out of the freezer and hold it in your hand. Did it crack?

boom!
 
Wow I'm retarded *facepalm* Thanks you!
 
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