This prefixes are also called SI-prefixes, where SI is an abbreviation for the French term "Système international d’unités" (International System of Units). Metric Prefixes Conversion. Metric system or SI units are based on factors of ten. 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. 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). 1 kilometer = 1,000 meters The exception are near the base unit (centi-, deci-, deca-, hecto-). SI Unit Prefixes . 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. Binary Prefix vs. SI Prefix In computing, a binary prefix is a set of letters that precede a unit of measure (such as a byte) to indicate multiplication by a power of two. The prefixes indicate whether the unit is a multiple or a fraction of the base ten. This online quiz is intended to give you extra practice in converting SI units. Use of these prefixes … Metric prefix or also referred to as SI prefix. Additional conversion factors are presented for energy, energy density, and energy yields. These prefixes are used to indicate a multiple or fraction of a unit. SI Prefixes The abbreviation SI is from the French language name Système International d’Unités (also known as International System of Units). ... (convert to & from base units, easier) Two-step conversions (convert to & from units with prefixes, harder) Both! 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. The abbreviation SI is from the French language name Système International d’Unités (also known as International System of Units). SI Conversions Practice Quiz. Usually, a measurement is reported using a unit with one of these prefixes. However, most units prefixes with names are 1000 times apart. 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. Twenty SI prefixes are used to combine with units of measure. SI Base Units and SI Prefixes. SI prefixes indicating orders of magnitude are provided in Table 2. 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