base

- noun the
__main__ingredient of something such as a paint or an ointment - noun a number that is taken as the basis of a system of
__calculation__, representing the number of units in the system - noun a class from which other classes can be derived by
__inheritance__

- The foundation of something, or the material that composes said foundation. For instance, silicon serving as a base material in semiconductor manufacturing, or
__acetate film__used as a base for magnetic recording__tape__. - In a bipolar junction transistor, the region between the
__emitter__and the collector, into which the emitter injects minority carriers. Also, the__electrode__attached to this region. Its symbol is B. Also called base region, base electrode, or base__element__. - A starting
__point__or basis, such as a base address. - A reference
__parameter__, such as__time__based on__atomic__frequencies. - A
__chemical__which does any of the following: that increases the proportion of hydroxyl ions in a__solution__, that accepts a proton in solution, that can react with an acid to__form__a salt, or that donates two electrons. According to the pH scale, a base has a__reading__of greater than 7.0, while an acid has a__value__below 7.0. The higher the reading, the stronger the base. - In an electron tube, the insulated portion through which its connecting terminals protrude.
- The number of digits used in a
__numbering system__. For example, 2 in the__binary system__or 10 in the__decimal system__. The base also serves as the__multiplier__within its numbering system. In the__decimal__system, for instance, each single__position__movement to the right of a__digit__represents a__division__by 10, while a movement to the left is a multiplication by 10. This can be seen, for example, in the number 153, where the 1 is in the hundreds position, the 5 is the tens, and the 3 is the units. Also called base number,__radix__, or radix number. - A number which is raised by a
__power__indicated by another number, called the__exponent__. For example, in 2^{8}, the 2 is the base, and the__8__is the exponent. - The number upon which a
__logarithm__system is based. That is, the number which is raised to a power indicated by an__exponent__. For example, log_{10}1000 = 3, as 10, the base in this example, must be raised to the power of three to__equal__1000. Logarithms may use any number as their base.__common__logarithms have a base of 10, and natural logarithms have a base equal to approximately 2.71828. - symbol B

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