Some materials, however, are easier to spin in this way than others, for if the molecules do not stick together, the liquid stream will break up.

ECONOMIST: Monitor

Drive the stream faster and the opposite happens: liquid separates, as it would in a centrifuge.

ECONOMIST: Acoustic microfluidics

Fractionators take a mixed stream of natural gas liquids (the liquid stuff that comes out of the ground along with natural gas) and process it into pure products like ethane, propane and butane.

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