Radiation - JSS2 Basic science Lesson Note

Radiation is a way heat moves from one place to another without needing a medium like air or water. It happens through electromagnetic waves, like light or infrared radiation.

Everything above absolute zero (-273.15°C or -459.67°F) emits radiation, but hotter objects emit more. For example, the sun emits a lot of radiation because it's super hot.

When this radiation hits an object, it can be absorbed, reflected, or transmitted. For instance, on a sunny day, the sun's radiation is absorbed by your skin, making you feel warm. In the same way, when you stand close to a fire, you feel its heat through radiation.