Understanding the Tyndall effect definition and examples in chemistry
Tyndall effect definition and examples :
The Tyndall effect is defined as the dispersion of light when a light beam passes through a colloid . Individual suspension particles scatter and reflect light, making the beam visible.
The amount of diffusion depends on the frequency of light and the density of the particles. As with Rayleigh scattering, blue light is more strongly scattered than red light by the Tyndall effect. Another way to see is that the longer wavelength light is transmitted, while the shorter wavelength light is reflected by the scattering.
The particle size is what distinguishes a colloid from a true solution. For a mixture to be a colloid, the particles must have a diameter of 1-1000 nanometers.
The Tyndall effect was first described by 19th century physicist John Tyndall.
Examples of Tyndall effect :
- Shining a flashlight beam in a glass of milk is a great demonstration of the Tyndall effect. You can use skim milk or dilute the milk with a little water so you can see the effect of the colloidal particles on the light beam.
- An example of how the Tyndall effect diffuses blue light can be seen in the blue color of the smoke from motorcycles or two-stroke engines.
- The visible beam of the headlights in the fog is caused by the Tyndall effect. Water droplets scatter light, making headlight beams visible.
- The Tyndall effect is used in commercial and laboratory settings to determine the size of aerosol particles.
- The opalescent glass displays the Tyndall effect. The glass appears blue, but the light shining through it appears orange.
- The color of the blue eyes comes from the diffusion of Tyndall through the translucent layer on the iris of the eye.
The blue color of the sky results from the scattering of light, but this is called Rayleigh scattering and not the Tyndall effect because the particles involved are molecules in the air, which are smaller than the particles in a colloid.
Likewise, the scattering of light from dust particles is not due to the Tyndall effect because the particle sizes are too large.
You may also like that