lämpösäteiden

Lämpösäteily, often referred to as thermal radiation, is electromagnetic radiation emitted by any matter with a temperature greater than absolute zero. This radiation is a form of energy transfer that does not require a medium and can travel through a vacuum. The spectrum of emitted radiation depends on the temperature of the object. Objects at lower temperatures emit longer wavelengths, typically in the infrared spectrum, while hotter objects emit shorter wavelengths, extending into visible light and even ultraviolet radiation.

The intensity and spectral distribution of thermal radiation are described by Planck's law, which relates the emitted radiation to the object's temperature and emissivity. Emissivity is a measure of how effectively a surface emits thermal radiation compared to a perfect blackbody at the same temperature. All objects above absolute zero emit thermal radiation, though the amount and type vary significantly. For instance, the Earth receives a substantial amount of thermal radiation from the Sun, which drives many of its climate processes. Conversely, objects on Earth, like ourselves, also emit thermal radiation, which can be detected by infrared cameras. This principle is utilized in various applications, from night vision technology to industrial temperature monitoring.