The International System of Units (SI) unit of illuminance. The symbol is lx. It is one of the SI derived units that is expressed with a specific name and symbol. It refers to the illuminance of a surface when a luminous flux of 1 lumen is uniformly distributed over an area of 1 square meter. It was adopted in Germany in 1897 and was also called the metric candle. The unit of illuminance in the imperial system is 1 lumen per square foot, or foot-candle, which is equivalent to 10.764 lux. [Koizumi Kesakatsu and Imai Hidetaka] [Reference item] | | |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
国際単位系(SI)の照度の単位。記号はlx。固有の名称と記号で表されるSI組立単位の一つ。1平方メートルの面積に、1ルーメンの光束が一様に分布しているときの表面の照度をいう。1897年ドイツで採用され、メートル燭(しょく)ともよばれた。ヤード・ポンド法の照度の単位は1ルーメン毎平方フート、すなわちフート・キャンドルで、10.764ルクスにあたる。 [小泉袈裟勝・今井秀孝] [参照項目] | | |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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