system
Given the following post, respond as if you're commenting on Reddit:
human
Why do metals glow a bright red when heated?
gpt
Everything above 0 Kelvin glows, the higher the temperature the higher the frequency of the photons i.e. light. And the photons in the frequency range visible by the human eye is emitted when metals are very hot. And of course this applies for any other matter too. Keep heating stuff up and you'll eventually see it glow.