Physics
Superconductors are those elements

Whose conductivity is intermediate between metals and insulators
Which turn into insulators at very low temperatures
Which conduct electricity only at super-high temperatures
Whose resistance falls almost to zero at very low temperatures

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Physics
Pressure Cooker cooks faster because

Boiling point decreases with rise of pressure
It cooks the food at low pressure
The material of the cooker is a good conductor
Higher temperature is attained for cooking

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