Thermodynamics is the science that studies the movement of heat. The first law of thermodynamics states that the total amount of energy in the universe always remains constant, and energy is easily transformed. The second law of thermodynamics describes the conditions under which energy transformation can take place.
When an object is heated, its particles accelerate and its body increases in volume. Heat is the atoms’ total quantity of kinetic energy; temperature measures the average energy with which they move. Temperature can be measured using the Celsius, Fahrenheit, and Kelvin scales.
Most bodies expand and become less dense when heated. Water expands as it cools and becomes denser when heated. Convection currents appear in liquids and gases as warmer particles rise and cooler ones fall.
A thermal machine (combustion engine) is an apparatus that transforms heat into other forms of energy. Electrical resistance disappears as its temperature approaches absolute zero—superconductivity.
This segment reviews the concepts of temperature and heat discussed in this video.
Credits: Temperature and Heat (Laws of Thermodynamics)
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Why do objects heat up? Why do certain changes take place in our universe? Thermodynamics is the study of how heat moves. This program will explore the laws of thermodynamics, with a special emphasis on the second law of thermodynamics.
Length: 17 minutes
Copyright date: ©2013
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What is Convection in Liquid or Gas...
Episode 6: Heat and the Human Body
Shedding Light on Heat
Episode 1: Temperature
Episode 3: Thermal Expansion
Episode 4: The Kelvin Scale
Episode 5: Heat Transfer
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