There's a Lever in Your Ear and It Does Something Amazing

Get 70% off NordVPN's 3-years plan and get an extra 1-month subscription on top. Some lucky people will get an extra 1-year subscription on top. Go to https://nordvpn.com/steve and use the promo code steve at checkout.

Impedance mismatch is when there's a difference in acoustic impedance between two mediums. When this happens sound is reflected at the boundary. There's a mismatch between air and the water in your inner ear. If it wasn't for a clever lever mechanism in your ear, most of the sound would be reflected back out at the boundary and our sense of hearing would be terrible! Two of the three bones in your middle ear act as a lever giving mechanical advantage to your eardrum.

The Ultrasound gel video is here:    • Ultrasound gel does amazing things to...  

Credits:
1) 3D ear animation - National Institute on Deafness and Other Communication Disorders, part of the National Institutes of Health https://en.wikipedia.org/wiki/File:Jo...
2) 2D ear diagram - Lars Chittka; Axel Brockmann https://commons.wikimedia.org/wiki/Fi...

You can buy my books here:
https://stevemould.com/books

You can support me on Patreon here:
  / stevemould  

just like these amazing people:

Nathan Williams
Matthew Cocke
Glenn Watson
Mark Brouwer
Joël van der Loo
Alex Southwell

Twitter:   / moulds  
Instagram:   / stevemouldscience  
Facebook:   / stevemouldscience  
Buy nerdy maths things: http://mathsgear.co.uk