aortic valve closure is typically the earlier component of the second sound of the heartbeat.
aortic valve closure is typically the earlier component of the second sound of the heartbeat.
what is typically the earlier component of the second sound of the heartbeat?
aortic valve closure
Na
Na
second sound









































second sound is a quantum mechanical phenomenon in which heat transfer occurs by wave-like motion, rather than by the more usual mechanism of diffusion. this leads to a very high thermal conductivity. it is known as "second sound" because the wave motion of heat is similar to the propagation of pressure waves in air (sound).









































normal sound waves are fluctuations in the density of molecules in a substance;









































second sound waves are fluctuations in the density of particle-like thermal excitations (rotons and phonons).









































second sound can be observed in any system in which most phonon-phonon collisions conserve momentum.
second sound