How does ultrasound generate heat?

[Green Xenon]

Hi:

 

What is the mechanism by which ultrasound generates heat?

 

 

Thanks,

 

Green Xenon

[insane_alien]

it causes vibrations in the material, friction and damping convert these waves into heat.

[Green Xenon]

it causes vibrations in the material, friction and damping convert these waves into heat.

 

 

What frequency of ultrasound will most efficiently heat up nitrogen [N2] gas molecules?

[insane_alien]

whichever frequency is the least transmissible.

[Green Xenon]

whichever frequency is the least transmissible.

 

Is this because nitrogen makes up most of Earth's atmosphere?

[insane_alien]

no