What Happens Below Absolute Zero?

Many people have heard about the phrase "absolute zero," not many know what it really implies, and fewer have asked themselves the question "what happens below absolute zero?" Are there upper and lower limits to temperature?Absolute zero is known to be 0 K (-273.15 °C, -459.67 °F) and it... [ read more >> ]

The four small rectangles at the midpoints of the square above are chip-scale refrigerators that cooled this cube and membrane to only a few hundred thousandths of a degree above absolute zero.

Image comment: The four small rectangles at the midpoints of the square above are chip-scale refrigerators that cooled this cube and membrane to only a few hundred thousandths of a degree above absolute zero.
Image credits: NIST

The four small rectangles at the midpoints of the square above are chip-scale refrigerators that cooled this cube and membrane to only a few hundred thousandths of a degree above absolute zero.
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