All gas stations prohibit making phone calls. Why is this?

Oil molecules will float in the air. Have you never heard of thermal expansion and contraction? Everyone knows what will happen when gas and oil meet sparks in the air. Can you guarantee that your shutdown will not cause a power outage? If you don’t call, will a hundred people not call? If you search the Internet for this question, you will find a lot of answers. The content of the answers is similar. It is nothing more than that when you make a call, the phone will emit electromagnetic waves, which will form radio frequency current in the metal conductor. Many friends have this experience. When you go to a gas station, you will be stopped by the staff if you use your cell phone. In the general consciousness of most people, talking on the phone at a gas station will cause a safety hazard. It will produce tiny sparks that can detonate oil and gas in the air.

The reason is that mobile phones emit radio waves when talking, and It is radio frequency electromagnetic radiation. Induced radio frequency current will be generated near the antenna that receives the radio and will generate circulating current near the metal object. If some areas of the metal object are resistant due to rust or other reasons, when the mobile phone is in normal standby, the internal current is only about 8~10mA. , including the radio frequency antenna, handset microphone, background light, etc., are all in working condition, the current inside the mobile phone may increase to 2-2.5A, and electric sparks may be generated. The first type: when there are strong electric waves in the place, through When you make a call on a mobile phone, the mobile phone also generates electromagnetism. Finally, under the action of electromagnetism, the mobile phone may ignite flammable gas

As we all know, it is not allowed to make calls while the car is refueling, and it is not allowed to use mobile devices to access the Internet near the gas pump. OK. The main reason is to prevent the occurrence of electric sparks from igniting high-concentration mixed oil and gas. Gasoline and diesel are very volatile fuels. Nowadays, gas dispensers are generally controlled by computers. Talking on a mobile phone may cause abnormal operation of the dispenser. In addition, the density of gasoline around the tanker is relatively high. When the mobile phone is used as an electronic device, sparks may be generated, causing the mixed oil and gas to explode. This should be basic common sense. Many people know it, but in real life, many people do not put safety first. When something happens, they can’t help but pick up the phone and call.