If cold isn’t real, then how can I feel it?
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You’vefelt cold before. Sometimes it’s cold outside. But what if I told you that “cold” isn’t real? There’s no substance or quantity called “cold” in science. We can’t measure the amount of “cold” in something. Instead it’s about what’s NOT there. In this week’s video, learn thedifference between heat and temperature, why a wind makes us feel colder, and what it’s like to live as a mass of jiggling atoms. This is the physics of cold.
Cool PBS NOVA episode on the search for absolute zero: https://www.youtube.com/watch?v=y2jSv8PDDwA
Richard Feynman on jiggling atoms: http://youtu.be/v3pYRn5j7oI
The movement of atoms in a wind: http://www.newton.dep.anl.gov/askasci/chem03/chem03448.htm
Why a breeze feels cool: http://physics.stackexchange.com/questions/72163/why-does-a-breeze-of-wind-make-us-feel-cooler
Density of the interstellar medium: http://en.wikipedia.org/wiki/Interstellar_medium
Have an idea for an episode or an amazing science question you want answered? Leave a comment below!
It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D.
Follow me on Twitter: @jtotheizzoe
Email me: itsokaytobesmart AT gmail DOT com
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Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios
Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc.
Kate Eads - Associate Producer
Andrew Matthews - Editing/Motion Graphics
Katie Graham - Director of Photography
John Knudsen - Gaffer
Dalton Allen - Post-Production Intern
“Ouroboros” by Kevin MacLeod
Other music via APM
Stock images from Shutterstock
Last week’s video:
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Why Did We Blow on NES Games? https://www.youtube.com/watch?v=4Gf9mtXnJfMThe Science of Game of Thrones - https://www.youtube.com/watch?v=Utu-LpJn3Is
There Was No First Human - https://www.youtube.com/watch?v=xdWLhXi24Mo
How The Elements Got Their Names - https://www.youtube.com/watch?v=mtg9p6A6xnY