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Title : Peanut butter is a liquid.
link : Peanut butter is a liquid.
Peanut butter is a liquid.
I'm reading "Don’t Try to Board a Plane with Peanut Butter/Sticky and solid as it may seem, the spread is technically a liquid" (The Atlantic).The author, Ted Heindel, a mechanical engineer who studies fluid flows, explains why it made sense for the TSA to subject a jar of Jif to the 3.4-ounce rule about "liquids." It may seem wrong, but how much do you really know about what is a liquid?
Any material that flows continuously when a shearing force is applied is a fluid. Think of a shearing force as a cutting action through a substance that causes it to flow continuously. For example, moving your arm causes the surrounding air to change shape—or deform, to use the physics term—and flow out of the way. The same thing happens to water when your arm takes a swim stroke. There are many kinds of fluids....
Air and water are Newtonian fluids — "the shear force varies in direct proportion with the stress it puts on the material." Peanut butter is a non-Newtonian fluid:
If you stir really fast, with more shearing force, the PB gets runnier; if you stir slowly, the PB remains stiff.... It doesn’t flow as easily as air or water, but it will flow if sufficient force is applied.... How easily it flows will also depend on temperature—you may have experienced peanut-butter drips on warm toast.....
But when is a fluid a liquid?
Both gases and liquids can be deformed and poured into containers, and will take the shape of their container. But gases can be compressed, whereas liquids cannot—at least, not easily. Peanut butter can be poured into a container, at which point it deforms, or takes the shape of that container.....
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I'm reading "Don’t Try to Board a Plane with Peanut Butter/Sticky and solid as it may seem, the spread is technically a liquid" (The Atlantic).
The author, Ted Heindel, a mechanical engineer who studies fluid flows, explains why it made sense for the TSA to subject a jar of Jif to the 3.4-ounce rule about "liquids." It may seem wrong, but how much do you really know about what is a liquid?
Any material that flows continuously when a shearing force is applied is a fluid. Think of a shearing force as a cutting action through a substance that causes it to flow continuously. For example, moving your arm causes the surrounding air to change shape—or deform, to use the physics term—and flow out of the way. The same thing happens to water when your arm takes a swim stroke. There are many kinds of fluids....
Air and water are Newtonian fluids — "the shear force varies in direct proportion with the stress it puts on the material." Peanut butter is a non-Newtonian fluid:
If you stir really fast, with more shearing force, the PB gets runnier; if you stir slowly, the PB remains stiff.... It doesn’t flow as easily as air or water, but it will flow if sufficient force is applied.... How easily it flows will also depend on temperature—you may have experienced peanut-butter drips on warm toast.....
But when is a fluid a liquid?
Both gases and liquids can be deformed and poured into containers, and will take the shape of their container. But gases can be compressed, whereas liquids cannot—at least, not easily. Peanut butter can be poured into a container, at which point it deforms, or takes the shape of that container.....
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