Answer is simple. Mobile phone can cause an explosion. How this happens? Petrol is highly inflammable and its gas vapour is present around the outlet in an inflammable form. At the same time,static electricity is also in the atmosphere, and on the surface of objects.
Static electricity in an imbalance in the amount of positive and negative charges within the surface of an object. There is strong e-field around these charges whether the charges are moving or still. Contact induced charge separation’ causes instant static discharges in the form of unnoticed sparks. Static electricity is most often noticed in dry climates. Mobile phone emits very strong radiation which is sufficient to cause sparks due to turbo charging. The same effect is applicable to LPG also. So do not use Mobile phone in Petrol outlets and near LPG cylinder.
Some thing about Static charge and ESD damage
Static electricity is often generated through tribocharging, the separation of electric charges that occurs when two materials are brought into contact and then separated. Examples of tribocharging include walking on a rug, rubbing plastic comb against dry hair, ascending from a fabric car seat, or removing some types of plastic packaging. In all these cases, the friction between two materials results in tribocharging, thus creating a difference of electrical potential that can lead to an ESD event.
Another cause of ESD damage is through electrostatic induction. This occurs when an electrically charged object is placed near a conductive object isolated from ground. The presence of the charged object creates an electrostatic field that causes electrical charges on the surface of the other object to redistribute. Even though the net electrostatic charge of the object has not changed, it now has regions of excess positive and negative charges. An ESD event may occur when the object comes into contact with a conductive path.