Absolute Zero: Lowest Possible Temp? Evidence Explained

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Absolute zero is defined as the temperature at which particle movement ceases, representing the lowest possible temperature. This concept is supported by examining temperature versus volume graphs of gases, which show a linear relationship at constant pressure. As temperature decreases, gas volume also decreases until it reaches zero at absolute zero, indicating a universal point for all gases. Experimental evidence aligns with this theoretical framework, confirming the existence of absolute zero. Understanding this concept is crucial in the study of thermodynamics and the behavior of matter at extreme temperatures.
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How can we say that Absolute zero is the lowest possible temperature?
Is there any experimental evidence for it?

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Malay
 
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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
 
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