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Warpspeed13
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I was reading about ferrofluid and I was wondering how you would go about calculating the maximum size of a particle that could be suspended by Brownian motion in a fluid? Can a denser fluid suspend larger particles?
mpelaez83 said:The response is: kT>mgd, where kT is thermal energy, m the mass of the particle, g is gravity and s is the particle typical size. When thermal energy is smaller sedimentation will occur.
Sorry but what units were you're original equation in, I assumed it was jules> kg* 9.82* surface area in m^2mpelaez83 said:You actually account for that through viscosity in some way. The carrier fluid as you call it is accountef by a viscosity and a temperature, the system temperature
Is kT the energy of one carrier fluid atom or the energy of the system?mpelaez83 said:g has units of m/s^2, d is in meters and m is in kg. Then you get joules.
Brownian motion is the random movement of particles suspended in a fluid. This phenomenon was first observed by Robert Brown in 1827, hence the name. It is caused by the constant collisions of the particles with the molecules of the fluid, which results in their erratic movement.
Brownian motion is caused by the constant collisions of particles with the molecules of the fluid they are suspended in. These collisions are random and unpredictable, resulting in the particles' erratic movement.
The rate of Brownian motion is directly related to temperature. As temperature increases, the molecules of the fluid move faster, resulting in more frequent and energetic collisions with the suspended particles, leading to increased Brownian motion.
Brownian motion is significant in science because it provides evidence for the existence of atoms and molecules, which were once thought to be theoretical. It is also used to study the properties of fluids and is an important concept in fields such as chemistry, physics, and biology.
Yes, Brownian motion can be observed in everyday life. Examples include the movement of dust particles in the air, the dispersion of ink in water, and the movement of smoke particles. It is also the driving force behind the diffusion of substances in and out of cells in living organisms.