5+1 Weird Chemicals
In case you missed the stuff of dreams article in the New Scientist Technology Blog here’s a quick overview, with one addition.
In the case of superfluids, a pressure difference across a tiny hole would cause a vibration in the superfluid at a frequency – the Josephson frequency – that increases as the pressure increases. The fact that the fluid oscillates back and forth through the hole rather than flows from the high-pressure side to the low-pressure side, as a normal liquid would, is one of the many weird aspects of quantum systems like superfluids.