A superconductor is a material that achieves superconductivity, which is a state of matter that has no electrical resistance and does not allow magnetic fields to penetrate. An electric current in a superconductor can persist indefinitely. Superconductivity can only typically be achieved at very cold temperatures. 

😝 Swish! Cảm ơn mình đã lựa chọn chủ đề hay và bổ ích!

Gee!  Tặng bà, với sự trân trọng. @thamle

 Kapow! Did you have any deep conversations today? @thamle

Mê mẩn! 😅💕 Afternoon, dear friends! How's your day been so far?