Journal Paper of the Day

Concetto Gianino, “Experimental analysis of the Italian coffee pot “moka””, in American Journal of Physics, Volume 75, Issue 1, January 2007, pp. 43-47.

I describe an experiment involving the moka Italian coffee pot. The pot is an ingenious device for making coffee that uses the liquid-vapor equation of state of the water and Darcy's law of linear filtration. The filtration coefficient of coffee is measured and a steam engine model is used to estimate the efficiency of the coffee pot.