do we know tonight about the blast in beirut the talk about that i'm joined by chemist and what castor andree is jealous good to have you on the program you've seen the video of the explosions and what happened from that we're going to show the videos again and maybe if you could talk us through it and tell us what you see when you're looking at the explosions what can be surmised from these blast klal. if i can just say one thing i could actually see your screen ok but i pretty well know what's going on in the video so i will attempt to describe things so the 1st thing is that there is a fire burning somewhere in the in the warehouse itself and that fire is clearly the thing which which triggered the really massive events that followed he was then a huge orange fireball which which is which is produced and this is the initial rather slow in kind of technical terms of explosion where presumably the ammonium nitrate really began to burn and blow up but moments later there is a 2nd type of explosion what's called the detonation and this is one which really happens and it's supersonic speed and