second sound
A wave of fluctuating temperature or entropy propagated in the superfluid phase of…A wave of fluctuating temperature or entropy propagated in the superfluid phase of liquid helium.
Meaning
1 senses(uncountable)A wave of fluctuating temperature or entropy propagated in the superfluid phase of liquid helium.
Lessons for this word
1 lessons- A1Countable and uncountable nouns — Because it can be uncountable