When you blow out a burning candle, the flame is extinguished, and the visible portion of the flame that was burning above the wick disappears. The flame is composed of hot gases, primarily carbon dioxide, water vapor, and other combustion byproducts, along with a small amount of unburned particles.
When you blow on the flame, you create a sudden burst of air that disrupts the balance of oxygen, heat, and fuel needed for the flame to sustain. The force of the air can also physically push the flame away from the wick, causing it to flicker and go out.
After extinguishing the flame, the hot gases and combustion byproducts disperse into the surrounding air. The hot gases rise due to their buoyancy, and they mix and dissipate into the atmosphere. The carbon dioxide and water vapor produced during the combustion process contribute to the gases released into the surrounding space.
It's worth noting that even though the visible flame is extinguished, there may still be residual heat and smoldering at the wick, which is why it is important to ensure the flame is fully extinguished before leaving a candle unattended.