How Does This App Blow Out Candles?

A video on YouTube. In Science & Engineering, a Krater category.

Summary by Krater

The host tests whether a smartphone app with a digital fan can blow out a candle and demonstrates how speaker cone movement, air pressure waves, and coherent versus incoherent airflow explain the result.

From the video

Answers: Can a smartphone app with a fan blow out a candle?

Smartphone app digital fan
Acoustic pressure waves
Sound wave propagation and airflow
Coherent vs incoherent air
Blow out a candle with sound

What it concludes

A smartphone app can blow out a candle because the speaker cone movement creates tiny pressure waves that push air out and pull it back in.
Sound waves do not move a bulk of air from one location to another, but instead vibrate back and forth.
Blowing air out creates coherent air where the bulk of air has the same speed and direction, whereas sucking air in draws it from all directions and is incoherent.
A smartphone app can extinguish a candle only when it is close enough because the air must be coherent and concentrated in a small area to have enough force.

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