What is explosion?
The explosion is a sudden increase of pressure and temperature, due to oxidation or other exothermic reaction. The rapid temperature and pressure rise resulting in an audible spherically propagating pressure wave. The sudden conversion of potential energy (chemical or mechanical) into kinetic energy with the production and release of gases under pressure or the release of gas under pressure is also cause of explosion. In addition to the familiar fire triangle of oxygen, heat, and fuel (the dust), dispersion of dust particles in sufficient quantity and concentration can cause rapid combustion know as a deflagration. If the event is confined by an enclosure such as a building, room, vessel or process equipment the resulting pressure rise may cause an explosion.
A smoke or fire gas explosion occurs when unburned pyrolysis products accumulate and mix with explosion of the pre-mixed fuel gases and air. This phenomenon generally occurs remote from the fire (as in an attached exposure) or after fire control.
The severity of an explosion depends on the properties of the flammable materials and the mixture of these materials with oxygen: the oxygen present in the air burns only with a particular quantity of the flammable material (oxidation). Depending on the severity of an explosion and the associated spread speed of the pressure wave, a distinction is made between low-speed detonation (cm/s), deflagration (m/s) and the strongest type of explosion, the detonation (km/s). The most severe of the explosions spreads at a rate faster than the speed of sound, thus developing immense destructive power.
What to do before explosion?
1. Build am emergency supply kit so you can survive in case of explostion happens.
2. Learn the risks in your home and working place and know how to minimize them.
3. Watch for heat illnesses like heat cramps, heat exhaustion, and heatstroke. In case you find any of them, call for an ambulance.
4. Make family emergency plan to know where reunite when everything finish.
What to do when explosion happens?
1. If you are close to the explosion epicenter - don't run away. The shock wave and flying pieces are faster than you can run. Hide under the sturdy table or behind the wall and wait until the first wave is finished.
2. Stay low if there is a smoke and dust. Cover your mouth and keep low while going to exit.
3. Do not use elevator. Use staircases to evacuate if they are nor damaged. Otherwise wait for help.
4. Check for fire and other hazards that may be engangering you
5. Once you are out, do not stand in front of windows, glass doors or other potentially hazardous areas.
6. If you are trapped in debris, use a flashlight, whistle or tap on pipes to signal your location to rescuers.
7. Shout only as a last resort to avoid inhaling dangerous dust, and only when help is already close and can hear you.
8. Cover your nose and mouth with anything you have on hand.
What to do after explosion?
1. There may be significant numbers of casualties or damage to buildings and infrastructure. Do not approach the buildings if you don't have.
2. If you know how, help the victims until the help comes.
3. Keep away from the fire, falling materials, dangerous gases and possible following explosions.