Tyndall effect - Revision history

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	[[Category:Optics]]		[[Category:Optics]]
	[[Category:Scattering]]		[[Category:Scattering]]
			<gallery>
			File:Why_is_the_sky_blue.jpg\|Why the sky is blue
			File:Iris_close-up.jpg\|Close-up of an iris
			File:Tyndall_Effect.jpg\|Tyndall Effect
			File:The_Tyndall_Effect_in_Fog.jpg\|The Tyndall Effect in Fog
			File:Koloidní_povoha_želatiny.jpg\|Koloidní povaha želatiny
			File:Lyubertsy,_A._A._Skochinsky_Mining_Institute_-_interior_(16781901395).jpg\|Interior of A. A. Skochinsky Mining Institute
			File:Lunar_Laser_McDonald_Observatory.jpg\|Lunar Laser at McDonald Observatory
			File:Internal_Pantheon_Light.JPG\|Internal Pantheon Light
			File:WaterAndFlourSuspensionLiquid.jpg\|Water and Flour Suspension Liquid
			</gallery>

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2025-02-10T00:36:21Z

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← Older revision		Revision as of 00:36, 10 February 2025
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	~~'''~~Tyndall effect''' or '''Tyndall scattering''' is a light scattering phenomenon in colloidal dispersion, while showing no light in a true solution. This effect was first observed by the 19th-century physicist [[John Tyndall]]. It is similar to [[Rayleigh scattering]], in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.		== Tyndall Effect ==

	~~==Overview==~~		[[File:Why_is_the_sky_blue.jpg\|thumb\|The Tyndall effect is responsible for the blue color of the sky.]]
	The Tyndall effect is ~~seen when light~~-~~scattering particulate matter is dispersed~~ in ~~an otherwise light-transmitting medium, when~~ the [[~~particle size]] is anywhere from features size to somewhat below the wavelength~~ of ~~the light. It is particularly applicable to colloidal mixtures and suspensions; for example,~~ the Tyndall effect ~~is used in commercial and lab settings to determine the size and density of particles~~ in ~~aerosols and other~~ colloidal ~~matter (see [[light scattering~~]] ~~theory).~~		[[File:Iris_close-up.jpg\|thumb\|The Tyndall effect can be observed in the blue appearance of some eyes.]]
			[[File:Tyndall_Effect.jpg\|thumb\|A demonstration of the Tyndall effect in a colloidal solution.]]

	~~==History==~~		The '''Tyndall effect''', also known as '''Tyndall scattering''', is the scattering of light by particles in a colloid or in very fine suspensions. It is named after the 19th-century scientist [[John Tyndall]], who first studied the phenomenon.
	The effect ~~was first observed~~ by [[John Tyndall]] ~~in 1859 and is credited to him. He observed that when light passes through a clear fluid holding small particles in suspension~~, the ~~shorter blue wavelengths are scattered more than the other colors, and so it appears blue. This is known as the Tyndall effect~~.

	==~~See~~ also==		== Explanation ==
			The Tyndall effect occurs when light passes through a medium containing small particles that are large enough to scatter light, but not large enough to settle out of the solution. This scattering causes the path of the light to become visible. The intensity of the scattered light depends on the frequency of the light and the density of the particles.

			The effect is more pronounced when the light is blue, which is why the sky appears blue. This is because blue light is scattered more than red light due to its shorter wavelength.

			== Examples ==

			=== In Nature ===
			The Tyndall effect is responsible for the blue color of the sky. As sunlight passes through the atmosphere, the shorter blue wavelengths are scattered in all directions by the gases and particles in the air. This scattered blue light is what we see when we look up at the sky.

			Another example is the blue appearance of some eyes. The structure of the iris scatters light in a way that enhances the blue wavelengths, making the eyes appear blue.

			=== In Everyday Life ===
			The Tyndall effect can be observed in many everyday situations. For example, when a beam of sunlight enters a dusty room, the path of the light becomes visible due to the scattering of light by the dust particles.

			In fog, the Tyndall effect can be seen when car headlights illuminate the tiny water droplets, making the beam of light visible.

			[[File:The_Tyndall_Effect_in_Fog.jpg\|thumb\|The Tyndall effect in fog illuminated by car headlights.]]

			== Applications ==
			The Tyndall effect is used in various scientific and industrial applications. It is used to determine the size and density of particles in a colloid. It is also used in [[laser]] technology and in the study of [[aerosols]].

			== Related pages ==
	* [[Rayleigh scattering]]		* [[Rayleigh scattering]]
	* [[~~Mie scattering~~]]		* [[Colloid]]
	* [[~~Critical opalescence~~]]		* [[John Tyndall]]

	~~==References==~~
	~~<references />~~

	~~[[Category:Scattering~~, ~~absorption~~ and ~~radiative transfer (optics)]]~~		== References ==
	~~[[Category:Colloidal chemistry]]~~		* Tyndall, John. ''On the Blue Colour of the Sky, the Polarization of Skylight, and on the Polarization of Light by Cloudy Matter Generally''. Proceedings of the Royal Society of London, 1869.
	~~[[Category:Physical phenomena]]~~		* Bohren, Craig F., and Donald R. Huffman. ''Absorption and Scattering of Light by Small Particles''. Wiley, 1983.
	~~[[Category:John Tyndall]]~~

	~~{{Physics-stub}}~~		[[Category:Optics]]
			[[Category:Scattering]]

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2024-02-25T18:20:04Z

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'''Tyndall effect''' or '''Tyndall scattering''' is a light scattering phenomenon in colloidal dispersion, while showing no light in a true solution. This effect was first observed by the 19th-century physicist [[John Tyndall]]. It is similar to [[Rayleigh scattering]], in that the intensity of the scattered light depends on the fourth power of the frequency, so blue light is scattered much more strongly than red light.

==Overview==
The Tyndall effect is seen when light-scattering particulate matter is dispersed in an otherwise light-transmitting medium, when the [[particle size]] is anywhere from features size to somewhat below the wavelength of the light. It is particularly applicable to colloidal mixtures and suspensions; for example, the Tyndall effect is used in commercial and lab settings to determine the size and density of particles in aerosols and other colloidal matter (see [[light scattering]] theory).

==History==
The effect was first observed by [[John Tyndall]] in 1859 and is credited to him. He observed that when light passes through a clear fluid holding small particles in suspension, the shorter blue wavelengths are scattered more than the other colors, and so it appears blue. This is known as the Tyndall effect.

==See also==
* [[Rayleigh scattering]]
* [[Mie scattering]]
* [[Critical opalescence]]

==References==
<references />

[[Category:Scattering, absorption and radiative transfer (optics)]]
[[Category:Colloidal chemistry]]
[[Category:Physical phenomena]]
[[Category:John Tyndall]]

{{Physics-stub}}