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On the eve of the French Revolution , France had an estimated quarter of a million different units of measurement. In many cases the value of a unit differed from town to town and even from trade to trade even though they might have the same name. This gave scope for fraud and hindered commerce and industry.

In England, Magna Carta in decreed that "there shall be one unit of measure throughout the realm", [3] However, France [2] and the rest of Europe had a multitude of measurement units. Differences such as these were multiplied almost infinitely across Europe. Between and , during the French Revolution , and with the backing of Louis XVI , the system of weights and measures was totally reformed.

Since it was not practical to realise the metre and kilogram, reference kilogram and metre artifacts, the metre des Archives and kilogramme des Archives were manufactured to meet these definitions as closely as possible. The modern metre is a refinement of the original artifact, but the kilogram is still waiting to be redefined. The new system was not popular and people continued to use their customary measures.

Napoleon recognised the value of a sound basis for a system of measurement but ridiculed the metric system. In he introduced the mesures usuelles , a modification of the metric measures for use in small retail businesses. These mesures usuelles used some older unit names but used the metre des Archives and the kilogramme des Archives as its basis for measurement. However, all government, legal and similar works still had to use the metric system and the metric system continued to be taught at all levels of education.

The metric system developed as the understanding of science and in measuring techniques have advanced. In this article, the term "SI" will be used to describe items that are specific to post developments, otherwise the term "metric system" will be used.

The driving force behind the metric system was the need for a single, rational and universal system of weights and measures that could be used worldwide. Each unit and each prefix has a symbol not abbreviation associated with it. In , during discussions about standardising electrical units of measure, Charles Bright and Latimer Clark proposed the units of measure be named, not in relation to what they are used for, or common objects, but after eminent scientists; with the electrical units of resistance, potential difference and capacitance being named the ohm , volt and farad in honour of Georg Ohm , Alessandro Volta and Michael Faraday respectively.

Historically, individual units evolved which were based on the size and context of what was being measured. These units could avoid the need to use large numbers of smaller units or small numbers of larger units for a measurement. These units were generally defined as a convenient multiple of a smaller unit and a convenient division of a larger unit. The metric system on the other hand uses prefixes to denote multipliers of the one basic unit.

Each unit and each prefix in the metric systems has been allocated a unique symbol by the CGPM. Unlike abbreviations which are a contraction of the local word for the unit in question, and which can therefore differ from one language to another, SI symbols are a form of standardised mathematical notation to represent the units and are the same in any language compare chemical symbols. There are certain circumstances where abbreviations as opposed to the SI symbols are used, particularly where safety is concerned.

This article will not differentiate between these various classes of units, other than to make references to them as appropriate. The metre is the base unit of length. Originally the metre was to have been one ten millionth of the distance between the North Pole and the equator. This portion of the meridian was to serve as the basis for the length of the half meridian, connecting the North Pole with the equator.

Although the bar was subsequently found to be 0. A hectare is about 2. However, the litre, one of the oldest metric units, having been formally defined in as the volume occupied by a cube with sides of one tenth of a metre [5] making it equal to 0. The litre is not technically part of SI, but its use is sufficiently widespread that it is "accepted for use within SI".

This artefact was replaced by one of British manufacture in which then became, and is still as of , the definitive kilogram, although it is anticipated that the kilogram will be redefined in terms of fundamental physical constants in the near future, thus bringing it in line with the other SI base units.

The kilogram is dissimilar to the other SI base units in that it is expressed as a multiple of another unit the gram with a multiplier prefix "kilo" added to it. Although the tonne is not an SI Unit, its continued use in many countries has led to it being "accepted for use within SI".

The degree Celsius symbol: Before the unit was known as " centigrade " from the Latin "centum" translated as and "gradus" translated as "steps". However, in France and Spain, the word " centigrade " also meant 0. When the metric system was first introduced in , all metric units could be defined by reference to the standard metre or to the standard kilogram. He chose the second rather than the minute or the hour as his unit of time, thereby implicitly making the second a base unit of the metric system.

This results in days becoming 1. The "sunrise" point of the eclipse on 14 January was back-calculated and, using 20th century data, should have been close to Lisbon. Ancient records however record the "sunrise point" as being in the Ionian Sea , off the coast of Greece. This difference can be accounted for by assuming that the Earth is slowing down, and as a result a day in Roman times was a little over 0. It was natural therefore that the astronomers under the auspices of the International Astronomical Union IAU took the lead in maintaining the standards relating to time.

Their value was adopted in by the 13th CGPM as being the definition of the second. During the 19th century, the British Association for the Advancement of Science took the lead in standardising units of measurement used in science and technology across the globe.

Under the leadership of men like James Clerk Maxwell and Lord Kelvin , the metric system was the system of choice. Some units that they developed are still in use today; others have been superseded. Scientists and engineers subsequently developed many other units of measure, some of which were discarded with the coming of SI. Scientific and technical units of measure frequently encountered by the layman today include:.

The metric system of measure was first given a legal basis in by the French Revolutionary government. The treaty established the following organisations to conduct international activities relating to a uniform system for measurements:. One master copy and a set of working copies were retained by the BIPM and the rest distributed to member nations. At intervals of about 25 years each nation returned their copies for re-calibration against the master copies.

Since then the metre has been redefined in terms of the speed of light, but as of October the kilogram is still defined by the prototype.

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Arabic is a popular language in the Middle East and North Africa, and is the language in which the Help was revealed to the Prophet Muhammad. Most students of Arabic will homework by studying Modern Help Arabic which is useful for watching the news, reading the newspaper, and communicating in academic settings.

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