For aerosol sprays such as Lysol, are they essentially creating “dustlike” par…

For aerosol sprays such as Lysol, are they essentially creating “dustlike” particles that float in the air?

Yes, except that the word “float” isn’t what you really mean. An aerosol is a suspension of fine solid or liquid particles in a gas. What holds those particles up against their downward weights isn’t the buoyant force—these particles are much more dense than the gas that surrounds them. Instead, it’s viscous drag. When the particles begin to fall downward through the gas, they experience such large upward viscous drag forces that they reach terminal velocity at only about 1 millimeter-per-second. The slightest breeze carries the particles with it so that they rarely have a chance to settle to the floor because of gravity. In an aerosol spray, the particles are carried forward by the gas emerging from the bottle and they hit the surfaces in front of the bottle.

How does a water aspirator pump work?

How does a water aspirator pump work?

The water aspirator pump is essentially a pipe with a narrowing in it. As water flows through that narrowing, it speeds up and its pressure drops—it’s exchanging its pressure energy for kinetic energy. A tiny opening in the side of the narrowing allows water or air to enter the high-speed flow. Since the pressure in that high-speed flow is very low, atmospheric pressure pushes fluids through the tiny opening and into the flow. The flow pumps fluids through the opening and into the water stream. If you connect a hose to the tiny opening, you can suck chemicals up the hose and into the water stream.

How does an airbrush work? Can you briefly explain it again.

How does an airbrush work? Can you briefly explain it again.

In an airbrush, slow-moving but high-pressure air from a hose is allowed to pass through a very narrow channel. As the air enters this channel, it speeds up and its pressure drops—it has exchanged its pressure potential energy for kinetic energy. The channel is so narrow and the air moves so quickly through it that the pressure inside the channel drops below atmospheric pressure! There is a tiny pipe that attaches to this channel at right angles and that dips into a bottle of paint. As the pressure inside the channel falls below atmospheric pressure, the atmospheric pressure in the paint bottle pushes the paint toward the channel. The paint begins flowing into the channel and it collides with the high-speed stream of air. The paint is ripped into tiny droplets and these droplets travels through the channel along with the air. As the air emerges from the narrow channel, its pressure rises and it slows down, but it still moves fast enough to carry the paint droplets to the object that’s being painted.