It is the movement of small particles caused by the fact that air mollecules are moving at high speed and hit the particles. It was firs noticed in pollen by a guy called Brown (so the name). He thought the pollen was moving coz it was alive, so he boiled it, but it still moved.
Dust particles move with Brownian motion due to random collisions with air molecules. These collisions impart random kinetic energy to the dust particles, causing them to move in a zigzag or erratic pattern. This phenomenon helps to explain the seemingly random movement of small particles in a fluid medium.
Heat
Added:
Basically heat is the cause of any movement, called kinetic energy.
It is the moving of molecules, ions and/or atoms, randomly hitting to the colloidal (relatively much bigger) particles that is called brownian motion.
Brownian motion is the rapid, erratic motion of particles dispersed in a liquid or gas. This motion is caused by the constant activity of the molecules around the particles.
Brownian movement is due to the constant collision of the molecules of the dispersion medium with that of the pollen grains that are sprinkled on the colloid.
It is due to the bombardment of air molecules on the dust particles.
Collisions between the grains/dust and atoms
Brownian motion is the random movement of particles in a fluid due to collisions with other particles in the fluid. This phenomenon was first observed by Robert Brown in the early 19th century when he noticed pollen grains moving in water. Examples of Brownian motion include the random movement of dust particles in the air, the motion of gas molecules in an enclosed space, and the movement of small particles suspended in a liquid.
Around 1900, there was a huge debate amongst scientists on whether the molecular hypothesis of nature -- ie that matter consisted of moving particles -- was something worthy of study. Basically, there was no experiment that had a result that required the existence of molecules. For that reason, many (if not most) scientists thought that only macroscopic, measurable entities (pressure, temperature) should be studied. Einstein showed that the Brownian Motion of small dust particles could only be explained as the random strikes of molecules in the atmosphere against the dust particle. Assuming the existence of molecules made the explanation of Brownian Motion trivial, assuming the opposite made an explanation impossible.
Heat motion is random.
Molecules in a fluid move constantly, freely, randomly, in all directions and with all possible velocities. This erratic motion of the molecules causes them to collide with anything in their path. when pollen grains are suspended in a gas, they fill a resultant force i particular direction and moves to another position, where it has to face same force again. For example, dust particles will be bombarded by the molecules moving at high speeds, causing them to have a zig-zag motion. Brownian motion also takes place in molecules in a liquid, but to a less obvious extent than in a gas.
When the charged rod touches the dry cork dust, it induces a charge separation within the dust particles. This causes the dust particles to become polarized, with one side becoming positively charged and the other negatively charged. The attraction between the charged rod and the polarized dust particles causes them to jump away violently as they try to align themselves with the electric field created by the rod.
You think probable to the Brownian motion.
I would guess that you are referring to Brownian motion. When a fine dust is spread on the surface of water you can observe the motion of the dust particles through a microscope as they are struck by water molecules.
That would be Brownian motion. That refers to small particles (for example, dust particles) suspended in a liquid or gas exhibiting random behavior - this is caused by liquid or gas molecules bumping into the dust particle.
The rapid zig-zag movement of tiny dust particles suspended in air or in liquid
jittering motions of pollen grains as viewed under a microscope
Brownian motion is the random movement of particles in a fluid due to collisions with other particles in the fluid. This phenomenon was first observed by Robert Brown in the early 19th century when he noticed pollen grains moving in water. Examples of Brownian motion include the random movement of dust particles in the air, the motion of gas molecules in an enclosed space, and the movement of small particles suspended in a liquid.
The random motion of small particles in the air is called Brownian motion (named after the botanist Robert Brown). This motion is caused by the collisions of the particles with the molecules of the gases making up the air.
whether DUST floats around, I suggest you read about Brownian motion. In a nutshell, it is well-established that particles suspended in a fluid (in this case, dust suspended in air) exhibit constant, random motion. Dust particles will eventually settle to the surface due to gravity, but any disturbance can kick them up again, and particles can remain suspended for very long times (the lighter the particle, the longer it can remain suspended).
== == Atoms were inferred to exist from the observation of "Brownian motion," which is the jittering of dust particles in air or water or some medium as seen through a microscope. The jitter is supposed to be caused by random collisions of atoms or molecules with the dust particles. If the medium were not composed of particles but were a smooth creamy substance without lumps, there would be nothing to make the dust particles jitter.
Around 1900, there was a huge debate amongst scientists on whether the molecular hypothesis of nature -- ie that matter consisted of moving particles -- was something worthy of study. Basically, there was no experiment that had a result that required the existence of molecules. For that reason, many (if not most) scientists thought that only macroscopic, measurable entities (pressure, temperature) should be studied. Einstein showed that the Brownian Motion of small dust particles could only be explained as the random strikes of molecules in the atmosphere against the dust particle. Assuming the existence of molecules made the explanation of Brownian Motion trivial, assuming the opposite made an explanation impossible.
Brownian movement, Brownian motion, or pedesis is the random movement of particles suspended in either a liquid or a gas. This is the movement that you see when sunlight is streaming through a window and you see the dust particles randomly moving. This movement helped to prove the existence of atoms and molecules. Many scientists, including Albert Einstein, used this motion to describe movements in the stock market, among other things!
pollen grains are attracted by a magnetic force