text: Albert Einstein and his student Leo Szilard invented and patented a version of this thing that had no moving solid parts, and therefore was unlikely to ever break or leak.
full_question: Albert Einstein and his student Leo Szilard invented and patented a version of this thing that had no moving solid parts, and therefore was unlikely to ever break or leak. The more common type of this thing does have a moving compressor to pressurize a vapor into liquid and force it through coils on the inside, but leaks of the fluid became less dangerous with the 1930 invention of freon. For 10 points--what device uses a Carnot cycle to pump heat from inside a container?
first_sentence: Albert Einstein and his student Leo Szilard invented and patented a version of this thing that had no moving solid parts, and therefore was unlikely to ever break or leak.