Final answer:
The primary factors affecting the movement in Brownian motion include temperature, molecule size, and the density of the medium. Changes in these factors can lead to significant alterations in the motion of particles suspended in a fluid.
Step-by-step explanation:
The movement observed in Brownian motion is influenced by several factors that affect how particles suspended in a fluid move in complex paths. One of the key factors is temperature, which directly affects the speed and kinetic energy of fluid molecules; higher temperatures lead to faster and more energetic collisions with the suspended particles, thereby increasing the intensity of Brownian motion.
Density also plays a role, as a denser medium can change the frequency and intensity of molecule-to-particle collisions. Molecular size is another factor, with smaller and more numerous molecules leading to smaller fluctuations in the movement of the suspended particles. Therefore, a change in these conditions can significantly alter the characteristics of Brownian motion. Additionally, it was Albert Einstein's work that explained how Brownian motion could measure the size of atoms, a significant scientific advancement.