Is 9 bars the ideal pressure for espresso?

What is the best brew pressure for espresso? Baristas all around the world are taught to set their espresso machine to 9 bars - so we thought it’s time to find out for ourselves if this tradition still holds up.

Thanks to Flair Espresso for providing the Flair 58 lever machine featured in this video: https://flairespresso.com/

Other videos in the extraction series:
Tamping - https://youtu.be/js8uiX9g1Cs
Distribution - https://youtu.be/Tvdnx-317Ss

Sections in this video:
0:00 The ideal brew pressure?
1:20 A note on pressure
2:40 The (pressure) tests
3:55 The results
8:08 How to adjust pressure
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