This translucent 1L vacuum jug is the perfect way to keep drinks either hot or cold. The quick press lid allows for easy opening and is 100% leak-proof. Hot coffee, tea, soup, cold drinks or cocktails will keep their perfect temperature for an extra long time. Great for journeys in the car, picnics or simply atop your table.
Water vapor does not take up more room than air. The air above the water, when heated, will eiethr gain volume or gain pressure. The air gains a slight amount of pressure and pushes the water the only place it can go, up the tube. This allows that air to stay at a lower pressure, but a higher volume. Also, for an eight cup siphon I believe one minute is too short a brewing time. I use: 2-3 cup 70 seconds, 5 cup