Which liquid has sufficient viscosity to be walked on? Detailed answer

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Which liquid has sufficient viscosity to be walked on? Detailed answer

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Which liquid has sufficient viscosity to be walked on?

If the viscosity of a liquid depends only on its nature and temperature, as, for example, in water, such a liquid is called Newtonian. If the viscosity also depends on the velocity gradient, it is called non-Newtonian. Such liquids behave like solids when force is suddenly applied. An example is ketchup in a bottle, which will not flow until the bottle is shaken. Another example is a suspension of cornstarch in water. If you pour it into a large container, you can literally walk on it if you move your feet quickly and apply enough force to each blow.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What are human teeth?

In order to better understand modern phenomena, it is necessary to know their evolution. You probably never thought about the origin of your teeth, right? But this is very interesting!

Human teeth are nothing but transformed fish scales!

Fish that lived on Earth hundreds of millions of years ago were covered with protruding scales. Those of them that were located near the jaws helped to hold and dismember the prey. Even in our time, human teeth and scales, for example, sharks have almost the same structure.

The tooth has three main parts: the root, located in a special recess in the jaw, the crown that protrudes above the gum, and the neck that separates these two parts.

Teeth don't "grow" out of our jaw like trees grow out of the ground. It would be more correct to compare them with plants in flower pots. Each tooth is fixed in its own bone "pot".

How does a tooth get the nutrients it needs? It turns out that an open “root canal” approaches it, through which nerves, arteries and veins pass. They enter the cavity of the tooth, or pulp, carrying with them all the necessary substances.

Most of the tooth is made up of a bony structure called dentin. The same part that we see is covered in enamel.

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