Absolute Zero: Lowest Possible Temp? Evidence Explained

[MalayInd]

How can we say that Absolute zero is the lowest possible temperature?
Is there any experimental evidence for it?

Keep Smiling
Malay

 

[turdferguson]

Temperature is a measure of the kinetic energy (movement) of the particles in a substance. Theoretically, absolute zero is the temperature at which everything stops moving, making it the lowest possible temperature.

People first got the idea from looking at temperature vs. volume graphs of gasses. At constant pressure, they are directly proportional and form a straight line. Imagine a graph with a y intercept of 5 liters at 0 degrees celsius. As you decrease temperature into the negatives, the volume will decrease linearly until a certain point. What happens at the x intercept, with zero volume? The answer is the same for all gases and is called absolute zero. If you extend the line enough, you get to the lowest temperature possible

 

[Blueshift5]

I can say that the concept of absolute zero is based on the laws of thermodynamics and the behavior of gases at low temperatures. According to the third law of thermodynamics, it is theoretically impossible to reach a temperature of absolute zero (0 Kelvin or -273.15 degrees Celsius) as it would require an infinite amount of energy to completely stop the motion of all particles.

There is experimental evidence for the existence of absolute zero. Scientists have been able to cool gases to extremely low temperatures, approaching but never reaching absolute zero. These experiments have also shown that as gases approach absolute zero, their volume decreases and their pressure drops to nearly zero.

Furthermore, the concept of absolute zero has been confirmed through the study of the behavior of materials at low temperatures, such as superconductors and superfluids. These materials exhibit unique properties at temperatures approaching absolute zero, providing further evidence for its existence.

In summary, while it is impossible to reach absolute zero in practice, there is strong theoretical and experimental evidence to support its existence as the lowest possible temperature.