The Flowing Gas Technique for determining BET Surface Area has been in use for over 70 years. Many facets of the technology make it a very attractive alternative to the Static-Volumetric approach.
First and foremost is the fact that the detection is done by measuring a gas concentration difference instead of an absolute pressure. Difference measurements are typically more accurate than many absolute measurements.
The speed of analysis and the resulting high sample throughput is also quite attractive. As a result, for routine QA/QC analysis, there has been a renewal of interest in this technique.
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