8
ASSEMBLING
THE SOPHON C
OFFEE BRE
WER
The Gourmia Siphon Coffee Brewer is a
vacuum coffee maker which operates as
a siphon, where heating and cooling the
lower vessel changes the vapor pressure of
water in the lower, first pushing the water
up into the upper tank, then allowing the
water to fall back down into the lower
vessel (carafe).
The principle of a vacuum coffee maker is
to heat water in the lower vessel
(A)
of the
brewer until expansion forces the con-
tents through a narrow tube
(B)
into the
upper tank containing coffee grounds
(as water temperature increases, dense
liquid water increasingly converts to
less dense water vapor gas, which takes
up more space and increases pressure);
when the water reaches and exceeds
the boiling point (so the vapor pressure
equals and then exceeds atmospheric
ASSEMBLING
THE SIPHON
COFFEE BREWER
UNDERSTANDING
THE SIPHON
COFFEE BREWING PROCESS
(A)
(B)
(C)
(D)
(1)
(2)
