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Videos de Conceptos Relacionados

Accuracy and Precision01:52

Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate measurements...
Rules for Significant Figures01:44

Rules for Significant Figures

In any measurement, the precision of the measuring tool is an essential factor. An ordinary ruler, for example, can measure length to the closest millimeter; a caliper, on the other hand, can measure length to the nearest 0.01 mm. As a result, the caliper is a more precise measurement tool because it can measure extremely minute changes in length. The measurements will be more accurate if the measuring tool is more precise.
It should be emphasized that when we represent measured values, the...
Measurement: Standard Units03:38

Measurement: Standard Units

Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
SI Units: 2019 Redefinition01:13

SI Units: 2019 Redefinition

Measurement is an indispensable part of analytical chemistry. The result of measurement helps quantify a substance's physical property and compare it with the physical property of another substance. Each measurement comprises two components - a number indicating the magnitude and a unit of measurement as a standard for comparison. Further, the same quantity can be measured using different units of measurement, which leads to differences in magnitude.
A standard set of units has been defined to...
Measurement: Derived Units03:02

Measurement: Derived Units

The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

Mediciones de precisión y constantes fundamentales.

F M Pipkin, R C Ritter

    Science (New York, N.Y.)
    |February 25, 1983
    PubMed
    Resumen

    Las técnicas de medición de precisión están avanzando, lo que afecta a la determinación de las constantes fundamentales. Los relojes de alta estabilidad y las unidades redefinidas mejoran la precisión, con implicaciones para las pruebas de relatividad general.

    Área de la Ciencia:

    • Metrología y Física Fundamental
    • Física experimental en la física experimental.

    Sus antecedentes:

    • Revisión de los avances recientes en las técnicas de medición de precisión.
    • Centrarse en la aplicación de estas técnicas para la determinación de constantes fundamentales.

    Objetivo del estudio:

    • Para examinar los desarrollos clave en la medición de precisión.
    • Para resaltar el impacto en las constantes fundamentales y la metrología.
    • Discutir las implicaciones para la física, incluyendo la relatividad general.

    Principales métodos:

    • Revisión de la literatura sobre relojes de alta estabilidad.
    • Análisis de la propuesta de redefinición del medidor.
    • Examen de los avances en el mantenimiento de las normas eléctricas.

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    Principales resultados:

    • Los relojes de alta estabilidad representan un desarrollo significativo.
    • La propuesta de redefinición del medidor es un avance notable.
    • Se logra una mayor precisión en las normas eléctricas.

    Conclusiones:

    • Las mediciones de precisión son cruciales para determinar las constantes fundamentales.
    • Los desarrollos en el cronometraje y las normas eléctricas están avanzando la metrología.
    • Estos avances tienen relevancia para probar teorías físicas fundamentales como la relatividad general.