Editing Tyndall effect (section)

== Comparison with Rayleigh scattering ==
[[Rayleigh scattering]] is defined by a mathematical formula that requires the light-scattering particles to be far smaller than the wavelength of the light.<ref name=":0">{{Cite web |title=Blue Sky and Rayleigh Scattering |url=http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html#c2 |access-date=2021-03-08 |website=HyperPhysics Concepts - Georgia State University}}</ref> For a dispersion of particles to qualify for the Rayleigh formula, the particle sizes need to be below roughly 40 nanometres (for visible light),{{Citation needed|date=March 2021}} and the particles may be individual molecules.<ref name=":0" /> [[Colloid]]al particles are bigger and are in the rough vicinity of the size of a wavelength of light. Tyndall scattering, i.e. colloidal particle scattering,<ref>{{Cite web |last= |title=Chemistry - Colloids |url=https://opentextbc.ca/chemistry/chapter/11-5-colloids/ |url-status=live |archive-url=https://web.archive.org/web/20210307070113/https://opentextbc.ca/chemistry/chapter/11-5-colloids/ |archive-date=Mar 7, 2021 |access-date=2021-03-08 |website= |publisher=OpenStax}}</ref> is much more intense than Rayleigh scattering due to the bigger particle sizes involved.{{Citation needed|date=March 2021}} The importance of the particle size factor for intensity can be seen in the large exponent it has in the mathematical statement of the intensity of Rayleigh scattering. If the colloid particles are [[spheroid]], Tyndall scattering can be mathematically analyzed in terms of [[Mie theory]], which admits particle sizes in the rough vicinity of the wavelength of light.<ref name=":0" /> [[Light scattering]] by particles of complex shape are described by the [[T-matrix method]].<ref>{{Cite journal|last=Wriedt|first=Thomas|date=2002|title=Using the T-Matrix Method for Light Scattering Computations by Non-axisymmetric Particles: Superellipsoids and Realistically Shaped Particles|url=https://onlinelibrary.wiley.com/doi/abs/10.1002/1521-4117%28200208%2919%3A4%3C256%3A%3AAID-PPSC256%3E3.0.CO%3B2-8|journal=Particle & Particle Systems Characterization|language=en|volume=19|issue=4|pages=256–268|doi=10.1002/1521-4117(200208)19:4<256::AID-PPSC256>3.0.CO;2-8|issn=1521-4117|url-access=subscription}}</ref>