1930: Albert Einstein and fellow nuclear scientist Leo Szilard receive an American patent for a new kind of refrigerator that requires no electricity.

The most famous physicist of the 20th century wasn’t a Thomas Edison: The fridge would prove to be one of Einstein’s few forays into the world of commonplace engineering.

The refrigerator uses chemical reactions of ammonia, butane and water to turn a heat input into a cold output.

Ammonia gas is released into a chamber with liquid butane in it. This reduces the boiling point of the butane, causing it to evaporate, and draw in energy from the...

Vendredi 11 novembre

Mobiles et PDA - 11 novembre 2011 :: 09:32 :: Par Eric