4K. Enough for to make "low temperature superconductors" like regular metals superconducting.
Contrast with liquid nitrogen, which is much cheaper but only goes to 77K.
- Helium | 0, 31, 1
- Chemical element | 0, 464, 24
- Chemistry | 136, 1k, 52
- Natural science | 0, 30k, 686
- Science | 0, 36k, 821
- Ciro Santilli's Homepage | 238, 147k, 2k
- Liquid nitrogen | 126