How many calories does a person need? Detailed answer

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How many calories does a person need? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

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How many calories does a person need?

It is believed that on average, one calorie per hour is needed per kilogram of body weight in the absence of hard physical work. Anything beyond that is extra calories.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What substance is the most common in the world?

a) Oxygen.
b) Carbon.
c) nitrogen.
d) water.

None of the above. Correct Answer: Perovskite is a mineral compound of magnesium, silicon and oxygen.

Perovskite makes up about half of the total mass of our planet. It is from it that the mantle of the Earth mainly consists. At least, scientists think so, but no one has yet been able to take samples confirming this hypothesis.

Perovskites are a family of minerals named after the Russian mineralogist Count Lev Perovsky in 1839. Perovskite is a veritable Holy Grail for superconductor researchers, as the material is capable of conducting electricity without any resistance at ordinary temperatures.

Thanks to perovskite, the world of "floating" trains and super-fast computers would become a reality. In the meantime, superconductors operate only at uselessly low temperatures (the highest officially recorded to date is minus 135 ° C).

In addition to perovskite, the Earth's mantle is believed to be composed of magnesium wustite (a form of magnesium oxide also found in meteorites) and a small amount of shistovite (named after Lev Shistov, a graduate student at Moscow University who synthesized a new form of silica under high pressure in 1959).

The mantle is located between the crust and the core of the Earth. It is supposed to be solid, although some scientists believe that the mantle is actually a very slow moving liquid.

How do we know all this? After all, even the stones erupted by volcanoes lay no deeper than 200 km from the Earth's surface, and exactly 660 km before the beginning of the lower mantle?

To estimate the density and temperature inside the planet, you can send seismic wave pulses down and record the resistance that these pulses had to face.

Further, the result obtained can be compared with our knowledge about the structure of minerals, samples of which we have - from the crust and meteorites - and about what happens to minerals under the influence of intense temperatures and high pressure.

However, all this - like many other things in natural science - is just another highly scientific guess.

Test your knowledge! Did you know...

▪ How many aggregate states of matter are currently known?

▪ Is it true that people only yawn when they are tired?

▪ Why is the sky blue during the day and red during sunset?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

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Random news from the Archive

400-channel driver chip for electronic paper displays 05.02.2014

Electrophoretic or e-paper screens are well suited for applications where there is an external light source and low power consumption is desired. They do not need backlighting and can be made flexible.

IXYS Integrated Circuits Division (ICD), a subsidiary of IXYS, has long been developing control ICs for such displays. Yesterday it introduced the IXEP1400 driver IC, which has 400 outputs operating at voltages in the +15 V range. The data coming through the shift register is used to control the pixels on the screen.

The IXEP1400 driver is designed for a maximum frequency of 50 MHz and is capable of bi-directional communication. Several IXEP1400 chips can be connected to a common data bus. The driver supports three-level transmission of gradations.

The IXEP1400 is a lower cost, lower power version of the industry's most widely used MXEI1480 driver. It can be used to work with segment and matrix displays. Among the areas of application of the novelty are wearable electronic devices, battery-powered mobile devices, additional displays of smartphones and tablets, e-books, electronic price tags, smart cards and information boards.

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