Blackbody Radiation: How Objects Glow With Heat

Blackbody radiation is the glow all objects emit when heated, depending only on their temperature.
A blackbody is an ideal object that absorbs all light and perfectly re-emits energy as radiation.
As objects heat up, they radiate more energy, first as infrared, then visible light.
The shift from red to white to blue glow shows hotter objects emit shorter wavelengths.
Stars shine as nearly perfect blackbodies, with their color revealing their surface temperature.
The Sun’s peak radiation lies in visible light, making daylight ideal for human eyes.
Wien’s Law predicts the wavelength of peak emission based on temperature.
The Stefan–Boltzmann Law shows that radiation intensity grows rapidly with temperature.
Incandescent bulbs glow because their filaments radiate like hot blackbodies.
Blackbody radiation links thermodynamics and quantum physics, helping explain energy quantization.