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Brownian motion see http://en.wikipedia.org/wiki/Brownian_motion
The haphazard motion of particles of matter is called brownian motion.
Some different types of random motion include Brownian motion (the random movement of particles in a fluid), particle diffusion (random movement of particles from areas of high concentration to low concentration), and random walk (a mathematical model describing a path that consists of a succession of random steps in various directions).
The branch of mechanics dealing with the mathematical description of motion is called kinematics. It focuses on studying the position, velocity, and acceleration of objects without considering the forces causing the motion.
It's called Brownian motion. It's caused by atoms and molecule zipping about (because of the energy they have as a result of being warm) colliding with the smoke particles and bumping them around. It would happen less if the smoke was very cold because the atoms and molecules would move less. Conversely, if you increased the temperature of the smoke the motion would be greater
If tiny particles like pollen are added to clear water and observed through a micrscope they will be seen to move about randomly. This was an early clue to the fact that matter is made of individual molecules which, in the case of liquids and gases, move about to cause the Brownian motion of the particles first observed by botanist Robert Brown.
"Haphazard" in this context means something like "disorganized".
Einstein's theory on Brownian motion states that the random motion of particles suspended in a fluid is caused by the collision of molecules with the particles, leading to a zigzag motion. He developed a mathematical model to describe the movement of these particles, providing evidence for the existence of atoms and molecules. Einstein's work on Brownian motion helped to establish the field of statistical mechanics.
Quantum mechanics is the branch of physics that combines quantum theory with wave motion of atomic particles. It provides a mathematical framework for understanding the behavior of particles at the atomic and subatomic levels.
The particles are tightly packed so they vibrate.
Sir Isaac newton is best known for mathematical ideas about gravity and motion.
Brownian motion