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Прочитайте текст и озаглавьте его. Superconductivity is a state of matter that chemical elements, compoundsand alloys assume on being cooled to temperatures near to absolutezero

Passengers. 2- The project of such an aircraft was 2. a speed five to six times above the displayed at speed of sound. | Text 8B | Прочитайте текст. | If he had known about the lecture, he would have come. Had he known about the lecture he would have come. | Упражнение 20. Найдите предложения с союзами before и after. | What do you think about it? Why? | Useful Words and Phrases of Scientific Communication at a scientific meeting, conference, round-table discussion, symposium, colloquium, seminar, session, congress, etc. | Упражнение З.Обратите внимание на инфинитивный оборот, состоящий из | Quot;I haven't any air inmy spare tire, either". | Safely clasped. neither could harm the other. Therefore, a handshake originally was a means of self-defense. |


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Superconductivity is a state of matter that chemical elements, compounds and alloys assume on being cooled to temperatures near to absolute zero. Hence, a superconductor is a solid material that abruptly loses all resistance to the flow of electric current when cooled below a characteristic temperature. This temperature differs for different materials but generally is within the absolute zero (-273° C). Superconductors have thermal, electric and magnetic properties that differ from their properties at higher temperatures and from properties of no superconductive materials.

Now hundreds of materials are known to become superconductors at low temperature. Approximately 26 of the chemical elements are superconductors. Among these are commonly known metals such as aluminum, tin, lead and mercury and several less common ones.

Most of the known superconductors are alloys or compounds.

It is possible for a compound to be superconducting even if the chemical elements constituting it are not.

TEXT 11C

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New Hope for Energy Recently some ceramic materials have been found to be super­conductors. Superconducting ceramics are substances which can transmit electric currents with no loss of energy at temperatures much higher than conventional superconductors (that is, at the temperature of liquid

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What is superconductivity? (the loss of electrical resistively by a, material on being cooled to temperatures near absolute zero).| Nitrogen).
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