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Peanut butter is a liquid – the physics of this and other unexpected fluids

  • Written by Ted Heindel, University Professor, Bergles Professor of Thermal Science, and Director of the Center for Multiphase Flow Research and Education, Iowa State University
Peanut butter is a liquid – the physics of this and other unexpected fluidsThe knife easily leaves swirls in the spread.rimglow/iStock via Getty Images Plus

Those Transportation Security Administration requirements are drilled into every frequent flyer’s head: You can carry on liquids that are only less than 3.4 ounces (100 milliliters) in volume each.

But when the TSA recently confiscated a jar of Jif under this...

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