The US Transportation Security Administration’s decision that peanut butter is liquid sparked a long debate on the Internet.


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Frequent air travellers may be familiar with the warnings that they can only carry liquids with a volume of less than 100 milliliters. However, the U.S. Transportation Security Administration (TSA) recently when he confiscates a jar of peanut butter under this rulecaused a revolt of peanut butter lovers. Some skeptics may suspect that hungry officers just want to feed themselves. However, the TSA peanut butter is a liquid and a full-size jar Claims to be over the 100 milliliter limit.

Is peanut butter liquid?

Although this story spread rapidly and caused many discussions on the internet, from the point of view of scientific definitions, We can say that peanut butter is indeed a liquid..

But to define whether something is liquid or not, you must first we need to define what a fluid is. Fluids are defined as any material that flows continuously when a shear force is applied. You can think of shear as a shearing action that causes matter to flow continuously. For example, moving your arm causes the surrounding air to deform and flow out of the way of your arm. This behavior can be more easily seen in the movement of the water during swimming.

There are many types of fluids. Some move very predictably and move smoothly, just like air or water. These are named after Sir Isaac Newton Newtonian fluids is called. A Newtonian fluid is, scientifically speaking, fluids in which the shear force varies in direct proportion to the stress (shear stress) exerted on the material. In a Newtonian fluid, the resistance of the substance to flow (viscosity) is stable at a certain temperature.

Other types of fluids do not move so smoothly and easily. In the case of certain substances such as peanut butterA minimum shear force may be required to keep the Imagine mixing a jar of peanut butter. If you mix too quickly with more shear force, the peanut butter will become more runny, while if you mix it slowly, the peanut butter will stay firm. For such liquids non-Newtonian or Fluids that do not obey Newton’s laws is called. Peanut butter’s flowing behavior can also be seen as more of a sticky behavior than a normal flow.

Because it does not flow as easily as air or water, but is fluid when enough force is applied, for example when spread on bread with a knife peanut butter can be a great example of a non-Newtonian fluid. How easily it flows will also depend on the temperature. For example, you can apply it more comfortably on a warm bread and then you can see it dripping from the bread like water.

Our daily lives are filled with unexpectedly fluid substances. In general, if a substance can flow, it is a fluid. And eventually it will take the shape of the container it is in.

Can all fluids be considered liquids?

Some surprising fluids like cream, mayonnaise, and cookie dough are other examples from the kitchen, like peanut butter. You can also find other everyday samples such as toothpaste.. Other strange fluids such as lava, mud floods, avalanches, and swamp sand are found in the natural world.

At this point, some objections may arise as the TSA has defined peanut butter as a liquid, not a liquid.

Fluids are divided into two general categories, gases and liquids.. Both gases and liquids can be deformed and poured into containers and take the shape of the container they are in. But gases are compressible, while liquids are (at least easily) incompressible.

Peanut butter can be poured into the container and deformed or take the shape of that container. And you probably know that peanut butter can’t be compressed easily. If you put the peanut butter between two pieces of bread or crackers and press it, it will flow out the sides with almost no jamming.

So we can safely say that peanut butter is not a flowing gas (probably without the need for such an experiment). For this reason (and for other reasons), the other type of fluid, liquid, is among the fluids, meaning it is a delicious liquid.

So liquid bans on airplanes apply to peanut butter as well as other tasty options like jelly…


The US Transportation Security Administration’s decision that peanut butter is liquid sparked a long debate on the Internet.

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