関連する実験動画
Updated: Jul 12, 2026

07:51
Measurements of Soil Carbon by Neutron-Gamma Analysis in Static and Scanning Modes
Published on: August 24, 2017
まとめ
義務付けられた測定方法は,十分な精度と研究室間バイアス評価が欠如しており,社会的コストが大きくなります. これらの測定システムの改善は,信頼性の高い科学および規制慣行にとって極めて重要です.
科学分野:
- 測定科学とは,測定科学のことである.
- メトロロジー・メトロロジー
- 規制コンプライアンス
背景:
- 政府機関には,物理的,化学的,生物学的現象の測定方法が義務付けられています.
- 既存の方法は,文献,自発的な標準化組織,および代理店開発から調達されています.
- 多くの現在の測定方法には,適切な精度および研究室間バイアス評価が欠けている.
研究 の 目的:
- 義務付けられた測定方法の欠陥を強調する.
- 不正確な測定に関連する社会的コストを強調するために.
- 測定システムの改善を提唱する.
主な方法:
- 既存の義務化された測定方法のレビュー.
- 精度と実験室間バイアスデータ (またはその欠如) の分析.
- 測定基準の起源と発展の評価.
主要な成果:
- 適正な精度で推定できるのは,義務付けられた数少ない方法である.
- 実験室間バイアスの評価を提供する方法はさらに少ない.
- 国家標準局が支援するものを除けば,ほとんどの国の測定システムは制御されていない.
結論:
- 信頼性の高い測定のための物理的および統計的要件に大きな改善が必要である.
- 信頼性の高い測定検証の欠如は,社会的コストを大きく引き起こす.
- 規制の正確性と信頼性のために,強化されたメトロロジック・プラクティスは不可欠です.
関連する概念動画
Units and Standards of Measurement
A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
Measurements of physical quantities are...
Units and Standards of Measurement
A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...
Measurements of physical quantities are...
International System of Units
The International System of Units, known as the SI system, is a universally accepted measurement system recognized and used worldwide. The SI system is based on a set of three base units considered absolute, and their values do not change with location. These base units are meters, kilograms, and seconds.
Prefixes are used to define both larger and smaller quantities in the SI system. For example, milli, micro, and nano define smaller quantities, while kilo, mega, and giga are used to define...
Prefixes are used to define both larger and smaller quantities in the SI system. For example, milli, micro, and nano define smaller quantities, while kilo, mega, and giga are used to define...
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...
A standard set of units has been defined to...
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.
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.

