átsugárzás

Átsugárzás is a Hungarian term that translates to "radiant heat transfer" or "heat radiation" in English. It refers to the process by which heat is transferred through electromagnetic waves, specifically infrared radiation. Unlike conduction and convection, which require a medium to transfer heat, radiation can occur through a vacuum.

This phenomenon is responsible for how the Earth receives heat from the Sun, as well as how a campfire warms people standing near it. All objects with a temperature above absolute zero emit thermal radiation. The intensity and spectrum of this radiation depend on the object's temperature and its surface properties. Hotter objects emit more radiation and at shorter wavelengths.

In practical applications, átsugárzás is a significant factor in building insulation, where materials are designed to minimize heat loss or gain through radiation. It also plays a role in industrial processes, such as in furnaces and kilns, and in everyday life, such as in the functioning of electric heaters and the cooling of electronic devices. Understanding átsugárzás is crucial for designing energy-efficient systems and predicting thermal behavior in various environments.