brownian movement
Học thuậtThân thiện
Definition
Noun: * Brownian motion; Brownian movement: The random, erratic, zigzag motion of microscopic particles (such as pollen or smoke particles) suspended in a fluid (a liquid or a gas), caused by continuous bombardment from molecules of the surrounding fluid.
Usage
- Brownian movement is a fundamental concept in physics and chemistry that provides direct evidence for the kinetic theory of matter and the existence of atoms and molecules.
- It is typically observed under a microscope.
- The term is often used interchangeably with "Brownian motion."
Examples
- Under the microscope, the scientist observed the Brownian movement of dust particles in water.
- The constant, random Brownian movement of pollen grains provided early evidence for molecular motion.
- Einstein's theoretical explanation of Brownian motion helped confirm the atomic nature of matter.
Advanced Usage
- "To exhibit Brownian movement": To display the characteristic random motion.
- The colloidal particles in the solution clearly exhibited Brownian movement.
- In quantitative contexts, "Brownian motion" is the more common term, especially in mathematics and financial modeling, where it describes a continuous-time stochastic process.
Variants and Related Words
- Brownian motion (n.): The more modern and frequently used synonym for Brownian movement.
- Brownian (adj.): Relating to or characteristic of Brownian movement.
- Brownian dynamics; Brownian noise
Synonyms
- Pedesis (a rare, technical synonym)
- Random walk (a related mathematical concept)
Notes on Meaning
- The phenomenon is named after the Scottish botanist Robert Brown, who first described it in 1827 while studying pollen grains in water.
- While "Brownian movement" and "Brownian motion" are synonymous in general scientific discourse, "Brownian motion" is the preferred term in formal mathematical and advanced physical contexts.
Noun
- the random motion of small particles suspended in a gas or liquid