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Absolute Zero
 
The lowest possible temperature that can be obtained, at which all molecular motion discontinues. The unit is written as 0 K or 0 Kelvin, named after William Thomson, who developed the scale and became Lord Kelvin in 1892.
The analogous temperature in other units is:
-273.16° Celsius
-459.69° Fahrenheit
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Further Reading:
  Basics:
After 100 Years of Debate, Hitting Absolute Zero Has Been Declared Mathematically Impossible
Wednesday, 15 March 2017   by www.sciencealert.com    
  News & More:
Physicists cool particles to less than a billionth of a degree above absolute zero to probe quantum magnetism
Monday, 5 September 2022   by cosmosmagazine.com    
Superfluid helium-4
Monday, 12 February 2018   by en.wikipedia.org    
Cooling MRI magnets without a continuous supply of scarce helium
Tuesday, 13 August 2013   by www.wired.co.uk    
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Celsius
 
A metric unit of temperature.
Definition: One degree is 1/273.16 of the difference between the triple point of water (at exactly 0.01°C) and absolute zero.
The triple point of water is the temperature at which water can exist simultaneously in the gaseous, liquid, and solid states. Absolute zero is the temperature at which all molecular motion discontinues.
The Celsius temperature scale is named for the Swedish astronomer and physicist Anders Celsius (1701-1744), who used a similar scale.
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Further Reading:
  Basics:
Essentials of the SI
   by physics.nist.gov    
  News & More:
How Many? A Dictionary of Units of Measurement © Russ Rowlett and the University of North Carolina at Chapel Hill
Wednesday, 21 March 2001   by www.unc.edu    
Evaluation of Absorbed Dose by MRI Read-Out
Saturday, 18 November 2017   by www.jstage.jst.go.jp    
After 100 Years of Debate, Hitting Absolute Zero Has Been Declared Mathematically Impossible
Wednesday, 15 March 2017   by www.sciencealert.com    
MRI Resources 
Health - Shielding - Process Analysis - Nerve Stimulator - Musculoskeletal and Joint MRI - Stimulator pool
 
Kelvin
 
(K) The SI unit of temperature.
Definition: One Kelvin is 1/273.16 of the difference between the triple point of water (at exactly 273.16 K) and absolute zero.
The triple point of water is the temperature at which water can exist simultaneously in the gaseous, liquid, and solid states. Absolute zero is the temperature at which all molecular motion discontinues.
0 K is according to -273,15° Celsius and -459° Fahrenheit.
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Superconducting Magnet
 
Superconducting magnets are electromagnets that are partially built from superconducting materials and therefore reach much higher magnetic field intensity.
The coil windings of superconducting magnets are made of wires of a type 2 superconductor (mostly used is niobium-titanium - up to 15 Tesla the critical temperature is less then 10 Kelvin). These coils have no resistance when operated at temperatures near absolute zero (-273.15°C, -459°F, 0 K).
Liquid helium (4.2 K) is commonly used as a coolant (sometimes in addition with a second cryogen liquid nitrogen as an intermediate thermal shield to reduce the boil-off rate of liquid helium), which consequently conclude refilling (intervals: liquid helium ~ 3 month, liquid nitrogen ~ 2 weeks). There are cryogen-free superconducting magnets with a closed-cycle refrigerating system at the horizon. Superconducting magnets typically exhibit field strengths of greater than 0.5 T, operate clinically up to 3 T, and have a horizontal field orientation, which makes them prone to missile effects without significant magnetic shielding.
See also Quenching.

See also the related poll result: 'In 2010 your scanner will probably work with a field strength of'
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Further Reading:
  Basics:
Superconducting Magnets
   by hyperphysics.phy-astr.gsu.edu    
Magnetic Field of the Strongest Magnet
2003   by hypertextbook.com    
  News & More:
A hot time for cold superconductors
Tuesday, 9 December 2003   by www.brightsurf.com    
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Superconductive
 
Superconductivity is a phenomenon occurring in certain materials at low temperatures, characterized by the complete absence of electrical resistance and the damping of the interior magnetic field. A ideal superconductor can carry an electrical current without experiencing energy losses (resistance, heat). The resistance of superconducting wire is nearly equal to zero at temperature near to absolute zero (-273.15° C or 0 K). This temperature is usually established by using liquid helium.

See also Superconducting Magnet, and Cryogen.
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Further Reading:
  Basics:
Superconductivity
   by en.wikipedia.org    
A hot time for cold superconductors
Tuesday, 9 December 2003   by www.brightsurf.com    
Unusual 'collapsing' iron superconductor sets record for its class
Wednesday, 8 February 2012   by www.eurekalert.org    
  News & More:
New Princeton study takes superconductivity to the edge
Thursday, 30 April 2020   by www.princeton.edu    
Cooling MRI magnets without a continuous supply of scarce helium
Tuesday, 13 August 2013   by www.wired.co.uk    
MRI Resources 
Cochlear Implant - Homepages - Health - Raman Spectroscopy - Directories - Mobile MRI
 
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