Because of the importance of heat transfer in science and technology, it is vital that quantitative ways of demonstrating these processes are available to students and teachers while studying the fundamentals in the classroom. This book presents such a new demonstration technique based on utilizing a thermal sensor called the heatmeter. The heatmeter is the thermal ammeter because it measures the thermal current or heat flow rate in the same way that the ammeter measures the electrical current in electricity. In Physics Laboratories that introduce the elements of heat and heat transfer, the modes of thermal energy transport are normally demonstrated with the aid of qualitative or, at most, semi-quantitative experiments that are inadequate. This book rectifies that problem.