Complex number, number of the form x + yi, in which x and y are real numbers and i is the imaginary unit such that i2 = -1.
Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.022140857 × 1023.
Thus alpha emission lowers the atomic number (number of protons) by two units, the neutron number by two units, and the mass number (total of neutrons and protons) by four units.
The mass number is commonly cited in distinguishing among the isotopes of an element, all of which have the same atomic number (number of protons) and are represented by the same literal symbol; for example, the two best known isotopes of uranium (those with mass numbers 235 and 238) are designated uranium-235 (symbolized 235U) and uranium-238 (238U).
Patient number: Number of patients for a specific population too small.
One of the fastest growing sectors is exports of skills and equipment to a growing number number of countries.
The effective parameters on the heat transfer and pressure loss were ordered as Reynolds number, number of injector, injector angle, diameter of injector and arranging type, respectively.
Design parameters are tube number, number of tube pass, inlet and outlet tube diameters, tube pitch ratio and tube arrangements (30, 45, 60 and 90°).
where the integer numbers j, M, N, and T are, the microphone number, number of sources, number of microphones, and order of the FIR filter, respectively.
Watch manufacturers would crow about the low number number of "doors" they had – a sign of exclusivity – and they were quite stingy when working with retailers, allowing only certain shops to carry certain items.
After some discussion about criteria (van der Vet, 1979), delegates to the 1923 IUPAC meeting saved the Periodic Table by decreeing that positions should be correlated with atomic number (number of protons in the nucleus) rather than atomic weight.
