Uploaded May 2022 | Updated September 2026, 2 weeks ago

---

Visit brilliant.org/ScienceAsylum to get started for free and get 20% off your annual subscription.

Infrared light can allow you to see many normally invisible things, but can it allow you to see through walls? Let's take a look at the flow of heat using a thermal camera and also using a simulation based on the heat equation.

Nick Lucid - Host/Writer/Editor/Animator
______________________________
AFFILIATE LINKS

FLIR ONE Pro (Android):
amzn.to/3tsigXa

FLIR ONE Pro (iPhone):
amzn.to/3E409vw

FTC Disclosure: These are affiliate links, which means I may receive a commission for purchases made through my links.
________________________________
VIDEO ANNOTATIONS/CARDS

Quantum Entanglement:
youtu.be/hiyKxhETXd8
________________________________
RELATED YOUTUBE VIDEOS

3blue1brown on Heat Equation:
youtu.be/ToIXSwZ1pJU
________________________________
SUPPORT THE SCIENCE ASYLUM

Patreon:
patreon.com/ScienceAsylum

YouTube Membership:
youtube.com/channel/UCXgNowiGxwwnLeQ7DXTwXPg/join

Advanced Theoretical Physics (Paperback):
lulu.com/shop/nick-lucid/advanced-theoretical-physics-a-historical-perspective/paperback/product-24250687.html

Advanced Theoretical Physics (eBook):
gumroad.com/l/ubSc

Merchandise:
scienceasylum.com
________________________________
HUGE THANK YOU TO THESE SUPPORTERS

Asylum Orderlies:
Dhruv Singhal, Fabio Manzini, Medec Hurtz

Einsteinium Crazies:
Bosphorus, Eoin O'Sullivan, Ilya Yashin, Jonathan Lima, Joseph Salomone, OnlineBookClub, Sean K, Wacky

Plutonium Crazies:
Al Davis, Compuart, Ellis Hall, Kevin MacLean, Rick Myers, Vid Icarus

Platinum Crazies:
Benjamin Dixon, Benjamin Reynolds, Clayton Bruckert, David Johnston, James Coley, Jon Adams, Jonas Wepeel, Jonathan Reel, Marino Hernandez, Mikayla Eckel Cifrese, Mr. Orn Jonasar, Olga Cooperman, Stephen Blinn, Stephen Gailey
________________________________
OTHER SOURCES

en.wikipedia.org/wiki/Thermal_diffusivity
https://tutorial.math.lamar.edu/classes/de/solvingheatequation.aspx
________________________________
LINKS TO COMMENTS

youtube.com/watch?v=hiyKxhETXd8&lc=Ugx2B10yttycigUKOu94AaABAg
youtube.com/watch?v=hiyKxhETXd8&lc=UgxyPMGHbaoarGOefZt4AaABAg
youtube.com/watch?v=hiyKxhETXd8&lc=UgyYDBJ7sGCRD7Hdi5l4AaABAg
________________________________
TIME CODES

00:00 Introduction
00:36 What is infrared light?
01:22 Can you see through walls?
03:44 The Heat Equation
05:13 Experiment Time!
08:14 Revisiting the Heat Equation
09:49 The Final Experiment
10:17 Sponsor Message
11:10 Outro
11:39 Featured Comment