Radiation is the transfer of heat in the form of electromagnetic waves. It does not require a medium and can occur in a vacuum. Examples include the heat from the Sun reaching the Earth. Unlike conduction and convection, radiation transfers energy through infrared waves or visible light.
Class 11 Physics Chapter 10 Thermal Properties of Matter covers concepts such as heat transfer methods including conduction convection and radiation. It explains thermal expansion and related coefficients like linear superficial and cubical expansion. The chapter also discusses specific heat and calorimetry and introduces laws like Stefan-Boltzmann law and zeroth law of thermodynamics.