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| light waves or particles, the band of colors produced when sunlight passes through a prism, comprising red, orange, yellow, green, blue, indigo, and violet |
| a very large colliding-beam machine in which superconducting magnets create millions of megavolts of energy |
| Boltzmann constant | |
| —n | |
| physics k the ratio of the gas constant to the Avogadro constant, equal to 1.380 650 × 10--23 joule per kelvin | |