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Denamic t1_j5rocnx wrote

Reply to comment by SXTY82 in Why does hot air cool? by AspGuy25

Thermal cameras use IR. IR, being light, bounces off reflective surfaces.


zebediah49 t1_j5s0zx3 wrote

The relevant point is that visible light will happily go through a normal glass window, whereas long-IR will not. Windows are opaque (and pretty reflective) to thermal cameras.