Having an espresso machine at work is a pretty sweet perk, but on the International Space Station, it's much more than that. The development of an espresso machine that works in microgravity was actually a marvel of science and engineering.
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Key Facts In This Video
The machine brews with superheated water. This requires a combination of heat and pressure, following the ideal gas law (PV=NRT). 00:49
Astronauts use zero-gravity coffee cups, which use surface tension to keep the espresso from floating away. 02:20
The water used comes from a combination of fresh and recycled sources, including distilled toilet water, sweat, and other waste. 07:02