The definition of a hectare is as follows: A hectare (symbol ha) is a metric unit of surface area, equal to 100 ares (the name is a contraction of the SI prefix hecto + are). Milli-(symbol m) is a unit prefix in the metric system denoting a factor of one thousandth (10 −3).Proposed in 1793 and adopted in 1795, the prefix comes from the Latin mille, meaning "one thousand" (the Latin plural is milia).Since 1960, the prefix is part of the International System of Units (SI). So 1 millihectare = 10-3 hectares.. In the international system of units (SI units), electrical current is measured in amperes (or amps), and abbreviated as “A”. n. Abbr. Tera (1 trillion) comes from the Greek word teras or teratos, meaning "marvel, monster," and has been in use since approximately 1947. You use two probes to measure parts of the circuit, ports to insert the probes, and usually a dial or a selection of buttons to choose the mode. Definition - What does Milliamp (mA) mean? SI Prefixes and Units Multimeters return a result in SI (the standard scientific) units for voltage, current and resistance, which are volts (V), amps (A) and ohms (Ω), respectively. Abbreviation: mCi, mc See more. The metric system unit becquerel, a measure of radioactive decay, is measured in inverse seconds. The word "milliamp" is short for "milliampere." The abbreviation for "ampere" is "A," and the abbreviation for "milliampere" is "mA." mL or ml A unit of volume equal to one thousandth of a liter. Millicurie definition, a unit of radioactivity equal to one thousandth of a curie; 3.70 × 107 disintegrations per second. However, the origin and history of peta with data measurement … A milliamp is a unit used to measure electrical current and is equal to one one-thousandth of an ampere. Learn more. The roentgen or röntgen (/ ˈ r ɜː n t ɡ ə n /; symbol R) is a legacy unit of measurement for the exposure of X-rays and gamma rays, and is defined as the electric charge freed by such radiation in a specified volume of air divided by the mass of that air (statcoulomb per kilogram). The meter is defined in terms of the speed of light and the second; definitions of the metric base units kilogram, ampere, kelvin, and candela also depend on the second. The only base unit whose definition does not depend on the second is the mole. But adding milli-to “meter” creates “millimeter,” which means one thousandth of a meter. Definition CIPM definition of the sievert. Example 1:: 10-6 kg = 1 mg (one milligram), but not 10-6 kg = 1 µkg (one microkilogram): Example 2:: Consider the earlier example of the height of the Washington Monument. Define milliliter. The prefixes exa (1 quintillion) and peta (1 quadrillion) were added to the International System of Units in 1975. milli- meaning: 1. 0.001 or one thousandth of the stated unit: 2. one thousandth, used in units of measure: 3. a…. We may write h W = 169 000 mm = 16 900 cm = 169 m = 0.169 km using the millimeter (SI prefix milli, symbol m), centimeter (SI prefix centi, symbol c), or kilometer (SI prefix kilo, symbol k). The ampere is the basic SI unit used to measure current, as established in 1948. ››Definition: Millihectare. A milliamp (mA) is a unit of measurement for an electric current flowing through an electrical conductor and a measure of the rate of flow of electrons. The SI definition given by the International Committee for Weights and Measures (CIPM) says: "The quantity dose equivalent H is the product of the absorbed dose D of ionizing radiation and the dimensionless factor Q (quality factor) defined as a function of linear energy transfer by the ICRU" . 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