Why do stripes in a tube of colored toothpaste stay even and do not mix? Detailed answer

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Why do stripes in a tube of colored toothpaste stay even and do not mix? Detailed answer

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Why do stripes in a tube of colored toothpaste stay even and do not mix?

Many of us use several strips of toothpaste (for example, red, white, and blue). However, why do the stripes stay even and the colors don't mix? For this, a special tube is used, patented in the USA in the late 1950s. The neck of such a tube is an elongated tube that ends at the filling level of the white base of the paste. Closer to the neck in this tube there are small holes through which colored fillers enter.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

At what temperature does water boil on the highest peak in the world - Chomolungme?

The boiling point - the phase transition from a liquid to a gaseous state (and vice versa) - of water, like any other substance, increases with increasing external pressure. At standard atmospheric pressure at sea level (101,3 kilopascals), the boiling point of water is 100 degrees Celsius.

At the highest peak in the world - Chomolungma, where the standard atmospheric pressure is 31,5 kilopascals, the boiling point of water is 69,7 degrees Celsius.

At a pressure equal to the pressure of water at a depth of 1 kilometer (9807 kilopascals), water boils at a temperature of 309,5 degrees Celsius.

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Identification of the owner of a mobile phone by fingerprint 24.07.2000

In South Korea, Samsung Electronics and PASS21 have jointly developed a special mobile phone with an integrated microchip that stores the owner's fingerprints. The latter also performs the functions of a regular credit card used by hundreds of millions of people on the planet.

With the help of Samsung specialists, a special sensor is additionally installed in a phone from which you can call anywhere, which allows you to determine the owner by sweat microparticles emitted by the fingertips. To use the novelty, it is necessary to connect store cash registers that read data from VISA, MasterCard or American Express credit cards with special electronic prefixes ("black boxes") worth only $10. The buyer approaches the cash register, opens the phone, puts his finger on the small window.

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