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Related Concept Videos

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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Related Experiment Video

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

Precision measurements and fundamental constants.

F M Pipkin, R C Ritter

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

    Precision measurement techniques are advancing, impacting fundamental constant determination. High-stability clocks and redefined units enhance accuracy, with implications for general relativity tests.

    Area of Science:

    • Metrology and Fundamental Physics
    • Experimental Physics

    Background:

    • Review of recent advancements in precision measurement techniques.
    • Focus on the application of these techniques to fundamental constant determination.

    Purpose of the Study:

    • To survey key developments in precision measurement.
    • To highlight the impact on fundamental constants and metrology.
    • To discuss implications for physics, including general relativity.

    Main Methods:

    • Review of literature on high-stability clocks.
    • Analysis of proposed redefinition of the meter.
    • Examination of advancements in maintaining electrical standards.

    Main Results:

    • High-stability clocks represent a significant development.

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    Related Experiment Videos

    Last Updated: Jul 12, 2026

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

    Published on: May 3, 2019

    In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence
    07:03

    In Situ Measurement of Vacuum Window Birefringence using 25Mg+ Fluorescence

    Published on: June 13, 2020

    Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy
    07:44

    Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy

    Published on: April 27, 2016

  • The proposed redefinition of the meter is a noteworthy advancement.
  • Increased precision in electrical standards is achieved.

    • Conclusions:

    • Precision measurements are crucial for determining fundamental constants.
    • Developments in timekeeping and electrical standards are advancing metrology.
    • These advancements have relevance for testing fundamental physical theories like general relativity.