Why is it strictly forbidden to make mobile phone calls at gas stations?

You are not allowed to use mobile phones at gas stations

In addition to the warnings "No lighting is allowed" at gas stations, you also often see related slogans "No using mobile phones". Why is this? It turns out that when a mobile phone is used as a radio communication tool, the radio waves (radio frequency electromagnetic radiation) emitted by the radio transmitter can induce radio frequency current in the antenna that receives the radio. When radio frequency current circulates between metal conductors, if there is corrosion or poor contact, radio frequency sparks will be generated. As long as the radio frequency spark lasts for more than one microsecond and the energy is greater than 6 milliwatts, it will ignite a mixture of methane and air with a certain concentration.

Because gasoline is a volatile substance, the oil and gas content in the air is high at gas stations, oil and gas tanks and natural gas pipeline leaks. Radio frequency sparks generated by mobile phones can easily cause explosions and lead to disasters.

Especially when a gas station fills a car or motorcycle fuel tank with gasoline through a fuel gun, the oil vapor in the original empty tank will disperse outwards, and the newly injected gasoline will evaporate into the air, causing the refueling vehicle to The density of surrounding oil and gas increased sharply. At the same time, in order to make communication signals clearer, mobile phones use high frequencies and relatively strong transmit power. Nowadays, refueling and gas stations are generally controlled by computers. High-intensity mobile phone signals will cause induction with computer equipment. The instantaneous electronic friction between the two may ignite fuel and gas, causing an explosion. The current required to ignite fuel gas is very small, and the static current generated by the mobile phone during operation can fully reach this limit. If you encounter cloudy or foggy weather with high air humidity and low air pressure when refueling or unloading oil, the possibility of explosion due to poor air circulation and corresponding increase in oil and gas density will further increase when talking on a mobile phone. big.

In addition, because the mobile phone itself does not have an explosion-proof function, if the mobile phone is used for a long time or the quality of the mobile phone itself is poor, the circuit of the internal chip of the mobile phone can easily cause a short circuit, so that the mobile phone can A small amount of sparks are produced, which can also cause an explosion at a gas station.