# Equal+in+number

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**Smooth number**— In number theory, a positive integer is called B smooth if none of its prime factors are greater than B . For example, 1,620 has prime factorization 22 × 34 × 5; therefore 1,620 is 5 smooth since none of its prime factors are greater than 5. 5… …122

**69 (number)**— This article is about the number 69. For other uses, see 69 (disambiguation). ← 68 70 → 69 ← 60 61 …123

**wave number**— the number of waves in one centimeter of light in a given wavelength; the reciprocal of the wavelength. [1900 05] * * * ▪ physics a unit of frequency in atomic, molecular, and nuclear spectroscopy equal to the true frequency divided by the… …124

**Non-Custodial Parents Party (Equal Parenting)**— The Non Custodial Parents Party (Equal Parenting) (formerly Non Custodial Parents Party) is a small Australian political party.[1] It has members in all states and territories of Australia. It supports less government control of many aspects of… …125

**acid number**— noun : a measure of the amount of free acids (as fatty acids) in a substance (as an oil or resin) usually expressed as the number of milligrams of potassium hydroxide required to neutralize one gram of the substance called also acid value * * *… …126

**Avogadro's number**— Chem. the constant, 6.02 × 1023, representing the number of atoms in a gram atom or the number of molecules in a gram molecule. Symbol: N Also called Avogadro constant. Cf. Loschmidt s number. [1925 30; see AVOGADRO S LAW] * * * Number of units… …127

**31 equal temperament**— In music, 31 equal temperament, which can be abbreviated 31 tET, 31 EDO, 31 ET, is the tempered scale derived by dividing the octave into 31 equal sized steps. Each step represents a frequency ratio of 21/31, or 38.71 cents.Division of the octave …128

**Froude number**— ▪ physics in hydrology and fluid mechanics, dimensionless quantity used to indicate the influence of gravity on fluid motion. It is generally expressed as F = v/(gd) 1/2, in which d is depth of flow, g is the gravitational acceleration… …