The reason: When you cook, gas will move from the tank through the pipe, wire and then to the burner. After the gas in the tank is locked tightly, a certain amount of excess gas will still remain in the pipe. This amount of gas has gone out of the tank and if not used up, it can cause a fire or explosion when the right conditions arise.
This way ensures that all gas in the pipe is consumed, helping to avoid waste and ensuring safety, without sudden flare-ups when turning on the stove next time.
Some notes when you use a gas stove to ensure safety
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