Thermodynamics
Thermodynamics involves the transfer of heat energy. When you touch a hot object, heat energy is transferred from that object into your hand. Thermal physics is related to thermodynamics, but also involves material science as well.
Heat is the internal kinetic energy of a substance, essentially the random twisting and shaking of the atoms and molecules of a substance.
Heat is transferred by one of three mechanisms. In conduction, heat energy is transferred by thermal contact between to objects. In convection, heatennergy is transferred by the bulk movement of a substance. In radiation, heat energy is transferred by electromagnetic radiation.
In everyday life, energy is conserved. If you mix a pail of hot water with a pail of cold water, their final temperature will different than the original temperature of the water in either pail, but the total final energy of the system shall be the same as the beginning energy.
Heat and Energy
Some things are hot such as a tea kettle full of boiling water. Other things are cold such as an ice cube.
What happens when hot objects and cold objects are mixed together? Cold objects get warmer and hot objects get cooler. For example, if you left some stones sitting in the hot sunlight until they here hot themselves, and then placed the stones in a bucket of cool water, the water would warm up and the stones would cool down. After a while, both the stones and water would be the same temperature.
Why does this happen? The first reason is called conservation of energy. Energy cannot be created or destroyed. It must stay the same. When the water warms up, the energy must come from the stones. When the water gains heat energy, the stones lose heat energy.
The second reason is that heat energy cannot move from cold objects to hot objects, unless work is done. For example, if you placed hot stones in a pail of cool water, the stones would NOT become cooler and the water warmer.
Thermal Physics
Thermal physics involves the transfer of heat energy. When you touch a hot object, heat energy is transferred from that object into your hand. Thermal physics is related to thermodynamics, but also involves material science as well.
Heat is the internal kinetic energy of a substance, essentially the random twisting and shaking of the atoms and molecules of a substance.
Heat is transferred by one of three mechanisms. In conduction, heat energy is transferred by thermal contact between to objects. In convection, heatennergy is transferred by the bulk movement of a substance. In radiation, heat energy is transferred by electromagnetic radiation.
In everyday life, energy is conserved. If you mix a pail of hot water with a pail of cold water, their final temperature will different than the original temperature of the water in either pail, but the total final energy of the system shall be the same as the beginning energy.
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