An iPhone app that extinguishes candles How does air come out?

(Image: The Action Lab YouTube)

Do you know an app called "Blower" distributed on the App Store? This application is an application that sends out enough air from the iPhone to extinguish the candles on the birthday cake. The Action Lab explains about such a mysterious app. [Photo] How a candle extinguishes on an iPhone When you turn on the power button in the app, something like a fan displayed on the screen starts rotating. Placing a lit candle near the iPhone's speaker while the fan is actually spinning extinguishes the candle. The Action Lab explains that there is no actual fan inside the iPhone, and that it uses sound and speakers to pump air. But sound waves vibrate in place, so they don't move air. To summarize The Action Lab's description, the speaker cone vibrates back and forth as it produces sound. The vibration draws air in and expels the same amount of air outward. The amount of air exhaled and the amount of air inhaled are essentially the same, but the way the air comes out seems to be different. When you exhale, the air comes out in a single point. But when you inhale, it collects air evenly around the intake, so it's stronger when you exhale, even though the same amount of air is moving. According to The Action Lab, when you put a candle in front of a speaker, the same amount of air is sucked in, but the air is pushed out to a single point and the flame goes out, explains The Action Lab. If you actually change the position of the candle, you can see that it is breathing in the fire depending on the location. It seems to be the same principle that makes it difficult to extinguish a candle by breathing in. In addition, the video confirms that the candle extinguishes when a 240hz sine wave is sent from the iPhone. (Source) https://youtu.be/tX6XSs2T5Gohttps://nerdist.com/article/smartphone-app-can-blow-out-candles-using-sound/

Kaz (Steezy inc.)