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Some article says ethanol adsorption was carried out for 30 min using a 2.0% ethanol/He gas mixture (1.0 mL/s),
as we know, ethanol is liquid, how to realize the gas mixture of ethanol and helium, and guarantee the volume fraction of 2%.
Is the gas mixture in the cylinder together or  with the help of flowmeter?

many thanks for help.
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