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.
under this rule, peanut butter lovers were up in arms. Some skeptics of security may suspect hungry officers just wanted to make their own PB&Js.
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. Other types of fluids do not move quite as smoothly and easily. For some, like peanut butter, a minimum shearing or cutting force may be needed to get it flowing, and it may vary nonlinearly with shearing strain. Imagine you're stirring a jar of peanut butter.
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