SI base units SI units & symbols SI / metric prefixes Unit definitions SI (metric) / Imperial conversion Often within electronics, and many other areas, quantities can become very large. These are unit prefixes that precedes the basic measurement unit. SI Unit Prefixes . The symbol is added to the unit symbol. For historical reasons, the name "kilogram" for the SI base unit of mass contains the name "kilo," the SI prefix for 10 3.Thus, because compound prefixes are unacceptable, symbols for decimal multiples and submultiples of the unit of mass are formed by attaching SI prefix symbols to g (gram). For example, the prefix name kilo, which equals 1,000 denotes a multiple of one thousand, as exemplified by:. Usually, a measurement is reported using a unit with one of these prefixes. Metric Prefixes are incredibly useful for describing quantities of the International System of Units (SI) in a more succinct manner.. It allows the reduction of zeros of a very small number or a very larger number such as 0.000 000 001 meter and 7,500,000 Joules into 1 nanometer and 7.5 Megajoules respectively. 1 kilometer = 1,000 meters This prefixes are also called SI-prefixes, where SI is an abbreviation for the French term "Système international d’unités" (International System of Units). SI Base Units and SI Prefixes. Metric prefix or also referred to as SI prefix. This system has nine SI base units, the SI units from which all others can be derived.. One of the advantages of any metric system is that it is a decimal system. The exception are near the base unit (centi-, deci-, deca-, hecto-). SI Prefixes The abbreviation SI is from the French language name Système International d’Unités (also known as International System of Units). Use of these prefixes … To make these numbers easier to manage and comprehend, there is a system of prefixes used that indicates a multiple or submultiple of the quantity. In 1960 the General Conference on Weights and Measures adopted the International System of units (or SI, after the French le Système International d' Unitès), which is a particular choice of metric units. This online quiz is intended to give you extra practice in converting SI units. ... (convert to & from base units, easier) Two-step conversions (convert to & from units with prefixes, harder) Both! However, most units prefixes with names are 1000 times apart. Metric system or SI units are based on factors of ten. These SI prefixes also have a set of symbols that precede unit symbol. SI Conversions Practice Quiz. The abbreviation SI is from the French language name Système International d’Unités (also known as International System of Units). Additional conversion factors are presented for energy, energy density, and energy yields. Twenty SI prefixes are used to combine with units of measure. Metric Prefixes Conversion. These prefixes are used to indicate a multiple or fraction of a unit. Because multiple prefixes may not be used, in the case of the kilogram the prefix names of Table 5 are used with the unit name "gram" and the prefix symbols are used with the unit symbol "g." With this exception, any SI prefix may be used with any SI unit, including the degree Celsius and its symbol °C. Select your preferences below and click 'Start' to give it a try! When exploring the world of electronics, these units of measurement are very important and allow people from all over the world to communicate and share their work and discoveries. Each individual prefix has it unique symbol. Introduction. An SI prefix (also known as a metric prefix) is a name or associated symbol that precedes a unit of measure (or its symbol) to form a decimal multiple or submultiple. 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