Cryogenics is related to:

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BHEL Engineer Trainee Mechanical 24 Aug 2023 Official Paper
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  1. Behavior and production of material at very high temperature (approximately above 800 K).
  2. Behavior and production of material at very high pressure (approximately above 200 MPa).
  3. Behavior and production of material at low temperature (approximately below 120 K). 
  4. Behavior and production of material at atmospheric conditions.

Answer (Detailed Solution Below)

Option 3 : Behavior and production of material at low temperature (approximately below 120 K). 
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Explanation:

Cryogenics

  • Cryogenics is the branch of physics that deals with the production and effects of very low temperatures (below 120 K).
  • The term is derived from the Greek words "kryos," meaning cold, and "genes," meaning produced.
  • Cryogenics involves the study of materials at temperatures far below those experienced in everyday life, often involving the liquefaction of gases.
  • Cryogenics focuses on the behavior and production of materials at extremely low temperatures.
  • The primary goal is to achieve temperatures where gases like nitrogen, oxygen, and helium liquefy.
  • This is done using various methods, including Joule-Thomson effect, adiabatic demagnetization, and cryocoolers.
  • At these low temperatures, materials exhibit unique properties such as superconductivity, superfluidity, and changes in electrical resistance.

Applications:

  • Medical Field: Cryogenics is used in cryosurgery to remove tumors and in cryopreservation to preserve biological samples like blood, sperm, and embryos.
  • Space Exploration: Cryogenic fuels, such as liquid hydrogen and liquid oxygen, are used as rocket propellants due to their high energy content.
  • Physics Research: Cryogenics is essential in studying quantum mechanics and particle physics. For instance, particle accelerators use superconducting magnets cooled to cryogenic temperatures.
  • Electronics: Superconducting materials, which exhibit zero electrical resistance at cryogenic temperatures, are used in high-performance computing and MRI machines.

Advantages:

  • Enables the study and utilization of unique material properties at low temperatures.
  • Facilitates advancements in various fields, including medicine, space exploration, and physics.
  • Allows for the storage and preservation of biological materials for extended periods.
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