A gas stove typically has a built-in ignition system that allows it to be lit with the turn of a knob. The ignition system is designed to create a spark or produce a small flame that ignites the gas coming out of the stove's burner.
When you turn the knob to the "ignite" position and blow on it, you are essentially providing a source of air or oxygen to the gas flow. Oxygen is necessary for combustion to occur. By blowing on the gas flow, you increase the oxygen supply around the gas, making it easier for the gas to ignite.
In some gas stoves, especially older models, the ignition system may not be automatic, and you may need to use a separate ignition tool like a lighter or a match to light the gas manually. In such cases, blowing on the gas flow can help in the same way by providing additional oxygen to aid the ignition process.
However, it's important to exercise caution when attempting to ignite a gas stove manually. Always follow the manufacturer's instructions and safety guidelines, and never attempt to light a gas stove if you suspect a gas leak. If you smell gas or suspect a leak, it's crucial to turn off the gas supply and seek professional assistance immediately. Gas leaks can be dangerous and require immediate attention from a qualified technician.