Does gravity act on dust particles in the air?
Yes, gravity does act on dust particles in the air.

Why do they still remain suspended in the air?
- Size and Weight: Dust particles are very small and lightweight, so the force of gravity acting on them is not strong enough to pull them down quickly.
- Air Resistance: When dust particles are suspended in the air, they experience air resistance which counteracts the force of gravity pulling them down. This helps to keep them floating in the air for longer periods of time.
- Upward Air Currents: In the atmosphere, there are upward air currents that can keep dust particles aloft. These currents push against the force of gravity, allowing the particles to remain suspended.
- Brownian Motion: Dust particles are constantly bombarded by air molecules, a phenomenon known as Brownian motion. This random motion helps to keep the particles suspended in the air as they are constantly being pushed around by the air molecules.
- Electrostatic Forces: Dust particles can also carry a slight electric charge, which can cause them to repel each other and remain suspended in the air. This electrostatic force can overcome the force of gravity pulling the particles down.
In conclusion, while gravity does act on dust particles in the air, there are various factors such as size, air resistance, upward air currents, Brownian motion, and electrostatic forces that work together to keep the particles suspended in the air.