Thread on #Lebanon #Beirut explosion:
Yesterday there were 3 waves:
1. The first waves felt and sounded like an explosion with a positive pressure

2. The second wave was a suction negative pressure that pulled eye witness (who were injured and told me this) around the room
The eye withness is a PhD Chemical Engineer teacher at Universities in #Beirut who was in his office close to the harbour.

3. The last explosion (always of the same source) was the biggest blast, more powerful than the previous two, with positive pressure
The producted in question is Ammonium nitrate, considered a stable component and can withstand very high temperature without exploding on its own.

All reported incidents worldwide to indicate that even when a fire caught ammonium nitrate, there is enough time to evacuate safely.
In some incident reported more than two hours of flame without an explosion occurred, which gives enough time to prevent the explosion and evacuate all personnel and civilians in the area.
In order for the explosion to occur, the ammonium nitrate should be subject to a shock, a very big shock

#ISIS use to use it in large quantities mixed with C4 to trigger the desired explosion.

the shock could be the result of an explosion or a build-up of a very high pressure+
In #Beirut, even if the ammonium nitrate was stored in a fully closed well-sealed area, high pressure is not likely to trigger the explosion.

The first explosion, according to the eye witness in the vicinity, was relatively small and not strongly felt but heard.+
This is the first explosion.
The second explosion is a suction pressure felt due to the burning of all the huge quantity of nitrate together and the flame sucks the air from the environment.
The whole burning was initiated by the first explosion which shifted the chemical reaction towards the high rate explosion.
The last blast caused the explosion after the reaction was already initiated.
Civilians in the vicinity TODAY are still feeling:
Dry mouth
Itch in respitarory tracks
red eyes
problems/difficulties in breathing
#Beirut #Lebanon
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