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French-fry lovers of the world can breathe a collective sigh of relief, because scientists have finally figured out the best way to get ketchup out of the bottle. Dr. Anthony Stickland of the University of Melbourne explains his findings in the university’s website, Pursuit, by accepting that ketchup isn’t a liquid, but rather a “soft solid,” like toothpaste.

Many condiments, like mayonnaise, are also soft solids and these substances do not follow Newton’s law of viscosity. You see, the tomato solids are suspended in liquid and in order to get the ketchup out of the bottle, the would-be diner must overcome the ketchup’s physical strength that comes from the solids touching each other. That strength resists motion, which is why it’s occasionally difficult to get ketchup out of a glass bottle.

Still confused? Here’s how to get the job done.

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