retention index

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Titanic infographic. The 30th anniversary of its discovery is September 1, 2015. SPOTLIGHT VERSION.

Timeline of the Titanic’s Final Hours

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How Deadly Is Quicksand?

Entrants falling and tumbling over while chasing the cheese at the 2016 'Cheese Rolling' held at Cooper's Hill, in the Cotswolds, Brockworth England

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9 of the World’s Deadliest Snakes

illustration of the walking titanosaurus, Patagotitan mayorum

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Battle of the Alamo from "Texas: An Epitome of Texas History from the Filibustering and Revolutionary Eras to the Independence of the Republic, 1897. Texas Revolution, Texas revolt, Texas independence, Texas history.

6 Wars of Independence

retention index

chemistry

Also known as: RI

Learn about this topic in these articles:

gas chromatography

In chromatography: Gas chromatography
…logarithmic scale this becomes the retention index (RI) introduced by the Swiss chemist Ervin sz. Kováts. The RI values of the solvent probes serve as the basis for the classification method introduced by Rohrschneider. Similar schemes have been suggested for liquid systems.
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