# What is Absolute Zero – The Lowest Temperature Possible

## What is Absolute Zero?

Absolute zero is the lowest possible temperature, defined as 0 Kelvin on the absolute temperature scale. This corresponds to -273.15 degrees Celsius or -459.67 degrees Fahrenheit. At this temperature, all matter would have zero thermal energy and be in its lowest possible energy state. The concept of absolute zero was first proposed by Lord Kelvin in the 19th century, as a way to establish a lower limit to temperature. The idea of absolute zero is based on the kinetic theory of gases, which states that the temperature of a gas is related to the average kinetic energy of its atoms or molecules. At absolute zero, all atomic and molecular motion would cease. In reality, the lowest temperatures that can be achieved are a few billionths of a degree above absolute zero.

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### Absolute Zero: The Lowest Temperature Possible

• Absolute zero is the lowest possible temperature, defined as 0 Kelvin on the absolute temperature scale. This corresponds to -273.15 degrees Celsius or -459.67 degrees Fahrenheit.
• At absolute zero, all matter would have zero thermal energy and be in its lowest possible energy state.
• The concept of absolute zero was first proposed by Lord Kelvin in the 19th century, as a way to establish a lower limit to temperature.
• The idea of absolute zero is based on the kinetic theory of gases, which states that the temperature of a gas is related to the average kinetic energy of its atoms or molecules. At absolute zero, all atomic and molecular motion would cease. What is Brownian Motion?
• Absolute zero is unattainable in practice, as it would require the complete absence of all thermal energy. In reality, the lowest temperatures that can be achieved are a few billionths of a degree above absolute zero.
• Despite this, scientists have been able to create some of the coldest temperatures in the universe, using techniques such as laser cooling, evaporative cooling, and magnetic trapping.
• These ultracold temperatures are important for a wide range of scientific and technological applications, such as studying the properties of matter at the atomic and subatomic level, and creating new materials with novel properties.
• The concept of absolute zero has also played an important role in the development of thermodynamics and the understanding of heat and temperature. It serves as a foundation for the absolute temperature scale, which is widely used in physics, chemistry, and engineering.
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