Lasers are usually associated with heat. But scientists have instead used them to reach the coldest temperature ever recorded. Could they reach absolute zero?
- Absolute zero is 0°K or -273.15°C.
- Lasers have been used by scientists in an attempt to reach absolute zero.
- Photons from a laser cool materials by reducing the speed of atoms.
- Physicists today are still striving to reach the limits of cold temperatures.
Lasers are associated with tremendous heat, but some physicists have been using them to reach the coldest temperatures ever recorded on Earth – absolute zero.
Absolute zero = 0 K or -273.15°C
The temperature at which atoms within substances cease to move.
Experiments in the 1900s, using liquefied gases, hydrogen and helium, brought …
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