Here's how it works:

1. The Bulb: The atomizer's bulb is designed to create a vacuum inside the bottle when it's squeezed.

2. Creating a Vacuum: When you squeeze the bulb, the air inside is forced out, creating a lower pressure inside the bottle than the pressure outside.

3. Liquid Rises: This pressure difference causes the perfume liquid to rise up the tube connected to the atomizer's nozzle.

4. Atomization: As the perfume rises, it's forced through a tiny hole in the nozzle. The high velocity of the liquid coming out of the small hole breaks it into a fine mist.

In simpler terms: You're using the bulb to create a suction effect, which pulls the perfume up and forces it out as a fine spray.