pop & funWikipediaearly 1900s · Italy

Espresso became modern when piston machines forced water through coffee at high pressure

the gist

Espresso is coffee brewed by forcing hot water through finely ground, compressed coffee under high pressure, which creates its foam, called crema. Early Italian machines from the early 1900s used steam to brew in bulk, and the drinks tasted burnt because the pressure was only about 1.5 bars. Achille Gaggia's piston machines, patented in 1938 and developed in 1947, used a lever-operated piston to push water at up to about 12 atmospheres, producing crema from oils and colloids. In 1961 Ernesto Valente's Faema E61 used an electric pump to reach about 9 bars, and it was cheap enough to spread across Italy's cafés. Espresso culture also spread into Italy's East African colonies.

so what

The espresso machine made coffee fast and consistent, which is why the drink became the base for lattes, cappuccinos and most coffee shop menus. The engineering history shows how a machine designed for busy cafés changed how coffee is made worldwide.

fun fact

Espresso means pressed out in Italian, referring to the brewing method.

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