Is Ketchup a Solid or a Liquid Video

Have you ever wondered whether or not ketchup was considered a liquid or a solid.  After all it can take a lot to get ketchup out of a bottle.  Sometimes you have to shake and squeeze really hard and then it all come squirting out.  Well in this TEDEd video they will explore the science behind ketchup and other similar substances' viscosity.
 

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