Stress

• Stress↑, dimension ↑, T_C↑, H_C affected

Frequency

• Frequency↑, Zero resistance – modified, T_C not affected

Impurities

• Magnetic properties affected

Size

• Size < 10^-4 cm – superconducting state modified

General Properties

• No change in crystal structure
• No change in elastic & photo-electric properties
• No change in volume at T_C in the absence of magnetic field.