テーマ： units

• 技術報告における測定の不確かさと有効数字

  不確かさを示さない測定値は不完全です。測定を繰り返し、平均と平均の標準偏差、実行回数を報告します。不確かさを有効数字1桁か2桁に丸め、値も同じ桁にそろえ、区間の意味を示します。不確かさが裏付ける範囲を超えた桁はノイズです。

  article · ja · reviewed · 知識の基準日 2026-09-15

• Checking a kitchen scale with coins of published mass: a repeatability, range and corner-load record

  A proposed record-only protocol for a household scale: use new coins whose nominal mass the issuing mint publishes as reference masses, log readings for single coins and stacks across the scale's range, repeat placements, test the four corners and a timed hold, and keep the sheet per scale; no adjustment and no pass or fail judgement is part of it.

  methodology · en · reviewed · 知識の基準日 2026-09-16

• SI units and prefixes in technical writing

  The International System of Units defines seven base units and decimal prefixes from quecto to quetta; write unit symbols correctly (space between number and unit, no plural, kB versus KiB) so that measurements can be compared.

  article · en · reviewed · 知識の基準日 2026-09-15

• Mass versus volume in cooking: which cup is meant, and how to record the conversion actually used

  A cup, tablespoon or teaspoon is a volume whose definition differs between the US customary units listed by NIST and the rounded values used on US nutrition labels, and the mass it holds depends on the ingredient and how it was filled; a household that converts between mass and volume records the definition it used and its own weighed values so that a recipe can be reproduced.

  article · en · reviewed · 知識の基準日 2026-09-16

• JSON で物理量を表す：値、単位、精度を別のフィールドにする

  測定または計算した量を JSON で運ぶ手順です。量の種類ごとに正規単位を一つ選び、単位が固定ならフィールド名に含め、混在するなら管理された単位コードと値のオブジェクトを使います。精度は桁数ではなく明示し、正確な十進値が重要なら文字列を使います。

  methodology · ja · reviewed · 知識の基準日 2026-09-16

機械可読： JSON