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A measurement is the result of the measurement action . This verb, originating in the Latin term metiri, It refers to the comparison that is set between a certain quantity and its corresponding unity to determine how many times said unit is contained in the quantity in question.

For example: "According to the last measurement, the pine that is next to the lake already measures more than thirty meters", "Before buying the chair, we have to measure the available space", "The final of the tournament was followed by TV by more than twenty million viewers, according to a measurement of the organizers".

The measurement, in short, is to determine what proportion exists between a dimension of some object and a certain unit of measure. For this to be possible, the size of the measured and the unit chosen must share the same magnitude .

The unit of measurement , on the other hand, is the Pattern which is used to specify the measurement. It is essential that you meet three conditions: inalterability (the unit must not change over time or according to the subject who carries out the measurement), the universality (must be used in any country) and the ease of reproduction . It should be noted that it is very difficult to perform an exact measurement, since the instruments used may be flawed or mistakes may be made during the task.

In music, the term "La 440" or "concert tone" is often repeated. This represents the standardization of the amount of vibrations per second that a given note has, the piano center, and allows consistency in the tuning of all instruments. The unit used is Hz and a fingerboard, an inseparable companion of opera singers and chorets, is usually used for measurement.

Earthquake Measurement

Countries like Japan, where earthquakes occur every year, invest millions in improving the detection techniques of earthquakes. Since there is no way to stop them, the only hope of those who suffer is anticipate tremors long enough for the inevitable evacuation. The aspects that can be measured in an earthquake are its magnitude and intensity, for which various scales are used. The best known are Richter, which focuses on the cause, and Mercalli, who observes the effect.

The scale Richter or local magnitude, lets know the energy that is released in the earthquake focus, the place where the fracture of the rocks originates and then extends through the seismic waves. his calculation It is based on a logarithmic expression that results in values ​​that are increasing so that each unit represents a magnitude 10 times stronger than the previous one. The highest grade ever recorded belongs to an earthquake in Chile in 1960, with a value of 9.5 Richter.

While the magnitude has a unique value, the intensity It varies along the diameter that the earthquake reaches. The Mercalli scale is used for this measurement, and its application varies according to the severity of the earthquake. Basically, the effects are observed at a specific site on the earth's surface and assigned a degree ranging from I to XII, in Roman numerals. The perception of the intensity of an earthquake is personal and varies according to where the person is at the time of the assessment, at the height, the type of building and soil, among other aspects. Thanks to this measurement, it is possible to improve citizens' protection strategies against this type of catastrophe.

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