| cycles per second | The number of successive compressions and rarefactions per second of a sound wave. The preferred designation for this unit of frequency is hertz. Acronym: cps (05 Mar 2000) |
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| Scholander, Per | <person> Norwegian physiologist, 1905-1980. See: Scholander apparatus, Roughton-Scholander apparatus, Roughton-Scholander syringe. (05 Mar 2000) |
| displacements per atom | (dpa) This is a measure of the amount of radiation damage in neutron-irradiated materials, for example, 10 dpa means each atom in the material has been displaced from its site within the structural lattice of the material an average of 10 times (due to interactions between the atoms and the energetic neutrons irradiating the material.) (09 Oct 1997) |
| Ling, Per Henrik | <person> Swedish hygienist, 1776-1839. See: Ling's method. (05 Mar 2000) |