This chapter is an important part of the Class 9 ICSE Physics syllabus and explains the concepts of heat, temperature, and energy transfer. Students learn about the effects of heat on matter, methods of heat transfer, and the relationship between heat energy and temperature. The chapter covers important ICSE concepts, experiments, and numerical problems related to thermal energy and its applications in daily life.• ICSE Class 9 Physics Heat and Energy chapter• Heat and temperature• Measurement of heat energy• Specific heat capacity• Transfer of heat – conduction, convection, and radiation• Effects of heat on matter• ICSE Physics numericals and experiments