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HomeHomework HelpphysicsAbsolute Zero

Absolute Zero

Absolute zero is the theoretical temperature at which all molecular motion ceases, corresponding to 0 Kelvin or -273.15 degrees Celsius, and represents the point of zero entropy in a system.

intermediate
2 hours
Physics
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Overview

Absolute zero is a fundamental concept in physics, representing the lowest possible temperature where all molecular motion ceases. It is defined as 0 Kelvin or -273.15°C and serves as a critical reference point in thermodynamics. Understanding absolute zero is essential for grasping the behavior of ...

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Key Terms

Absolute Zero
The lowest possible temperature, where molecular motion stops.

Example: Absolute zero is 0 Kelvin or -273.15°C.

Kelvin
A temperature scale that starts at absolute zero.

Example: Water freezes at 273.15 K.

Thermal Energy
The energy that comes from the temperature of matter.

Example: Thermal energy increases as temperature rises.

Cryogenics
The study of materials at very low temperatures.

Example: Cryogenics is used in preserving biological samples.

Kinetic Theory
A theory that explains the behavior of gases in terms of particles in motion.

Example: Kinetic theory helps explain gas pressure.

Third Law of Thermodynamics
States that as temperature approaches absolute zero, the entropy of a perfect crystal approaches zero.

Example: This law implies that absolute zero is unattainable.

Related Topics

Thermodynamics
The study of heat and temperature and their relation to energy and work.
intermediate
Quantum Mechanics
The branch of physics that deals with the behavior of matter and light on atomic and subatomic levels.
advanced
Cryogenic Engineering
The field of engineering that deals with the production and use of very low temperatures.
advanced

Key Concepts

TemperatureKelvin ScaleThermal EnergyCryogenics