Where is 5 gallons in a corny?

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duckredbeard

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I know I could use a known volume of a flask or such to calibrate a corny volume. Call me lazy. Where exactly is the 5 gallon mark on a corny keg? The weld? Up to the gas in tube?
 
I'm expecting a 2L Erlenmeyer flask from a lab supply retailer (Fisher Scientific) to be accurate.
 
i always mark my carboys at the 5g line. - and usually never transfer a full 5g to the keg due to trub loss etc.
 
Water (SG 1.000) weighs 8.328676 lb/gal. Get an accurate scale, add water till you get 41.54 lbs. net
 
Depends on what you mean by accurate. Erlenmeyers are NOT accurate by lab standards--a graduated cylinder is a better choice.

The weigh method is much better, but remember that only distilled water at 20 C has that density.

Accuracy may be over-rated in brewing. As long as you brew the same way, any errors should cancel out from batch-to-batch giving reproducible results.
 
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