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Analytical · Glossary

What is a Gas Chromatograph?

Symbol: GCcomposition by separationAnalytical

A gas chromatograph separates a gas or vaporised liquid sample into components in a column and measures each one as it leaves.

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Gas Chromatograph Explained

A carrier gas pushes the sample through columns; components travel at different speeds and reach the detector at different times. Thermal conductivity and flame ionisation detectors are common.

Process GCs give full composition, calorific value and density for natural gas and refinery streams, with cycle times of minutes.

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Calculators for Gas Chromatograph

CalculatorGas Mixture Molecular Weight CalculatorFree online calculator with formula and worked example.CalculatorGas Energy Flow CalculatorFree online calculator with formula and worked example.

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Frequently Asked Questions

What is a Gas Chromatograph?

A gas chromatograph separates a gas or vaporised liquid sample into components in a column and measures each one as it leaves.

Why is a GC slow?

Components must separate in the column, which takes time.

What is retention time?

The time a component takes to pass through the column, used to identify it.

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All analytical terms · Full glossary A to Z

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