One type of wave in these substances moves with velocity proportional to entropy times the square root of temperature over specific heat.
One type of wave in these substances moves with velocity proportional to entropy times the square root of temperature over specific heat. It's not a BEC, but Sinha, Sivaram, and Sudarshan proposed a quantum gravity theory in which the background vacuum is a substance of this type. They are utilized in the namesake SHeDS spectroscopy, and experience wavelike heat transfer called second sound. High energy phonons in these substances are called maxons, contrasting with the low energy rotons postulated by Lev Landau. In the fountain effect, these substances creep up the sides of their containers as a Rollin film. At the 2.17 Kelvin "lambda point," helium-4 transitions to this state. For 10 points, name this low-temperature phenomenon in which a fluid has zero viscosity.
One type of wave in these substances moves with velocity proportional to entropy times the square root of temperature over specific heat.
superfluidity [accept word forms]