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Thermal physics is the study of heat. Heat energy, or thermal energy, is the energy of a substance or system in terms of the motion or vibration of its molecules. The faster the molecules in a substance move the more heat energy they have. Temperature is the average kinetic energy of the molecules in a substance.

Thermal physics deals with the internal energy of objects due to the motion of the atoms and molecules comprising the objects, as well as the transfer of this energy from object to object, known as heat.

Important Topics of Thermal Physics Heat Transfer. First Law of Thermodynamics and Heat Capacity. Second Law of Thermodynamics. Newton's Law of Cooling. Reversible and Irreversible Processes. Carnot Engine. Temperature and Thermal Expansion. Specific Heat Capacity and Mean Free Path.

The thermal energy is usually expressed by Q. It is directly proportional to the mass of the substance, temperature difference, and the specific heat. The SI unit of thermal energy is Joules(J).

Differentiate between the three major areas of thermal physics: thermodynamics, kinetic theory, and statistical mechanics.

Thermal conductivity refers to how well an object can transfer thermal energy. Objects that have high thermal conductivity are good conductors of heat and vice versa. Thermal conductivity of a substance is given by the letter k.

What is Thermodynamics? A branch of physics, thermodynamics is the study of the relationship between properties of heat, temperature, energy, and work.

Important Topics of Thermal Physics Heat Transfer. First Law of Thermodynamics and Heat Capacity. Second Law of Thermodynamics. Newton's Law of Cooling. Reversible and Irreversible Processes. Carnot Engine. Temperature and Thermal Expansion. Specific Heat Capacity and Mean Free Path.