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, 37, 1
- Chemical element | 0, 594, 37
- Chemistry | 136, 1k, 71
- Natural science | 0, 49k, 1k
- Science | 0, 53k, 1k
- Ciro Santilli's Homepage | 262, 182k, 3k
- Liquid nitrogen | 132, 152, 2