Measurement units of the International System (I - b) a history of kilogram (and other mass units) | From the Mediterranean
Last week we talked about entanglement measures "mass" (or weight or volume of aggregates or liquid) that have arisen in different cultures, the systematizing of which even has more problems than the Traditional measures of length or distance. In a country like ours, already addicted to the metric system, but we do go in grams in kilograms or tonnes (metric), and the volume we use a liter (or hectoliters) or, if necessary, measures equivalent to inches cubic (cc equal to ml) or cubic meter. In school we are taught the difference between weight and volume (each object portable food warmers has its specific weight or density, which translates to one another), and also between weight and mass (the weight of an object is the product of the mass of the object and the gravitational acceleration suffering). The kilogram is the SI unit of mass. Kilogram? It is not the gram? There is a multiple kilogram (x 1000) of gram? Yes it is an etymological sense, but not technical. Gram is technically a submultiple portable food warmers of the kilogram, the same way that a metric ton of multiple kilogram. To see the reason for this contradiction, we review the history of (kilo) gram.
The law of 18 germinal year III defines the metric according to five basic units closely related to each other. First, there is the meter as a unit of distance (and defined as the ten-thousand-lionèssima of the Paris meridian between the equator and the North Pole). The meter has multiples and submultiples. The decàmetre has ten feet, and a decimeter is one tenth of a meter. The surface given by the square portable food warmers of one decàmetre length is the area (are) which is surveying unit. If we take the volume is determined by one meter cube of edge, we obtain the ester, unit volume of Aryans (for dry wood, put the case). Similarly, if we take the volume is determined by 1 decimeter cube edge, get a liter, which will drive volume for liquids. As we drive too gram. And, as defined gram?
Apparently, all five units are linked in the same way. We can simplify things and say that one area is 100 m2, a ester 1 m 3 and a liter is 0.001 m 3 (or 1 dm 3.'s Why that area, the estuary and the liter are not considered base units in the International System today. almost never used the area, and used predominantly to define extensions hectare averages of agricultural or forest land. ester has completely fallen into disuse: many aggregates are measured by weight more easily than by volume and measured volume expressed in m3. liter has resisted the best, and if sometimes milliliter far behind in cm3 (or cc) , the microliters (and nanolitres, and picolitres femtolitres) resist in the field of nanovolumètrica, the typical unit are hectoliters of wine and oil, the quilolitre has nothing to do with its equivalent in m 3 .
However the relationship between the gram meter is more complex. In 1795 the definition portable food warmers one has to refer to a substance (water). Water becomes the pattern density (1 g / cm 3 or 1 g / ml). But what water? A salt-laden water tends to turn its density portable food warmers (more dense) portable food warmers than pure water. That is why the law speaks of pure water. The density also varies with temperature. In general, the higher the temperature, the lower the density of water. The density of pure liquid water reaches a maximum temperature near the melting ice. Hence the reference for the definition discussed. In any case, the gram is defined portable food warmers as a certain amount of water, portable food warmers which is a unit of mass, not a unit of weight (force). But gram can be a unit of weight, portable food warmers as the definition suggests, as the weight of the mass of a gram. The idea of defining a unit of weight (or mass) from a volume of water is ancient and in modern times, the formula John Wilkins, reflecting on a standardized system of measures in its 1668 work .
A gram is a unit of weight (or mass) relatively small. An ounce is a little over 30 grams. The alternative to the gram, developed since 1793, was the gravel (gravel), defined as the mass of a liter of water (pure water at freezing temperature). Recorded equivalent by definition to 1000 grams.
The definitions of metric units of law in germ III were, only the starting point of the metric portable food warmers system. True that elegance definitions, scientific objectivity, were of significant value. But it was necessary, at least a meter-building pattern and burn pattern. Patterns served portable food warmers to build sub-patterns, which r
Last week we talked about entanglement measures "mass" (or weight or volume of aggregates or liquid) that have arisen in different cultures, the systematizing of which even has more problems than the Traditional measures of length or distance. In a country like ours, already addicted to the metric system, but we do go in grams in kilograms or tonnes (metric), and the volume we use a liter (or hectoliters) or, if necessary, measures equivalent to inches cubic (cc equal to ml) or cubic meter. In school we are taught the difference between weight and volume (each object portable food warmers has its specific weight or density, which translates to one another), and also between weight and mass (the weight of an object is the product of the mass of the object and the gravitational acceleration suffering). The kilogram is the SI unit of mass. Kilogram? It is not the gram? There is a multiple kilogram (x 1000) of gram? Yes it is an etymological sense, but not technical. Gram is technically a submultiple portable food warmers of the kilogram, the same way that a metric ton of multiple kilogram. To see the reason for this contradiction, we review the history of (kilo) gram.
The law of 18 germinal year III defines the metric according to five basic units closely related to each other. First, there is the meter as a unit of distance (and defined as the ten-thousand-lionèssima of the Paris meridian between the equator and the North Pole). The meter has multiples and submultiples. The decàmetre has ten feet, and a decimeter is one tenth of a meter. The surface given by the square portable food warmers of one decàmetre length is the area (are) which is surveying unit. If we take the volume is determined by one meter cube of edge, we obtain the ester, unit volume of Aryans (for dry wood, put the case). Similarly, if we take the volume is determined by 1 decimeter cube edge, get a liter, which will drive volume for liquids. As we drive too gram. And, as defined gram?
Apparently, all five units are linked in the same way. We can simplify things and say that one area is 100 m2, a ester 1 m 3 and a liter is 0.001 m 3 (or 1 dm 3.'s Why that area, the estuary and the liter are not considered base units in the International System today. almost never used the area, and used predominantly to define extensions hectare averages of agricultural or forest land. ester has completely fallen into disuse: many aggregates are measured by weight more easily than by volume and measured volume expressed in m3. liter has resisted the best, and if sometimes milliliter far behind in cm3 (or cc) , the microliters (and nanolitres, and picolitres femtolitres) resist in the field of nanovolumètrica, the typical unit are hectoliters of wine and oil, the quilolitre has nothing to do with its equivalent in m 3 .
However the relationship between the gram meter is more complex. In 1795 the definition portable food warmers one has to refer to a substance (water). Water becomes the pattern density (1 g / cm 3 or 1 g / ml). But what water? A salt-laden water tends to turn its density portable food warmers (more dense) portable food warmers than pure water. That is why the law speaks of pure water. The density also varies with temperature. In general, the higher the temperature, the lower the density of water. The density of pure liquid water reaches a maximum temperature near the melting ice. Hence the reference for the definition discussed. In any case, the gram is defined portable food warmers as a certain amount of water, portable food warmers which is a unit of mass, not a unit of weight (force). But gram can be a unit of weight, portable food warmers as the definition suggests, as the weight of the mass of a gram. The idea of defining a unit of weight (or mass) from a volume of water is ancient and in modern times, the formula John Wilkins, reflecting on a standardized system of measures in its 1668 work .
A gram is a unit of weight (or mass) relatively small. An ounce is a little over 30 grams. The alternative to the gram, developed since 1793, was the gravel (gravel), defined as the mass of a liter of water (pure water at freezing temperature). Recorded equivalent by definition to 1000 grams.
The definitions of metric units of law in germ III were, only the starting point of the metric portable food warmers system. True that elegance definitions, scientific objectivity, were of significant value. But it was necessary, at least a meter-building pattern and burn pattern. Patterns served portable food warmers to build sub-patterns, which r
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