tyndall effect
Definition
Noun: - A physical phenomenon: The Tyndall effect is the scattering of light by microscopic particles suspended in a transparent medium (a liquid or a gas). This scattering makes the path of a light beam visible when viewed from the side. The scattered light is predominantly blue in color.
Usage
The term is used specifically in physics and chemistry to describe the visible evidence of light scattering by colloidal particles. It is a key method for distinguishing between a true solution and a colloidal dispersion. - The Tyndall effect is easily observed when a beam of sunlight enters a dusty room. - Scientists used the Tyndall effect to confirm the colloidal nature of the mixture.
Advanced Usage
- Scientific Principle: The effect is named after the 19th-century physicist John Tyndall. It is a classic demonstration of Rayleigh scattering, where shorter wavelengths (blue light) are scattered more strongly than longer wavelengths (red light).
- The blue color of the sky is a natural example of the Tyndall effect, caused by the scattering of sunlight by molecules in the atmosphere.
Variants and Related Words
- Tyndall scattering: A more technical synonym for the Tyndall effect.
- Colloid: A mixture where one substance of microscopically dispersed particles is suspended throughout another substance. The Tyndall effect is a defining property of colloids.
- Rayleigh scattering: The elastic scattering of light by particles much smaller than the wavelength of the light. The Tyndall effect is an application of this principle.
Synonyms
- Light scattering (in the context of colloids)
- Tyndall scattering
Related Phrases and Concepts
- Colloidal dispersion: A system where the Tyndall effect is observable.
- Milk is a colloidal dispersion and exhibits a strong Tyndall effect.
- Distinguishing solutions from colloids: A common laboratory application.
- If the beam is visible, the Tyndall effect is present, indicating a colloid, not a true solution.
Noun
- the phenomenon in which light is scattered by very small particles in its path; it makes a beam of light visible; the scattered light is mainly blue
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