煤煙（Soot，又稱煙灰）是一种因碳氫化合物燃燒不完全而產生之成分不純的碳粒子，泛指包括煤、石油焦等燃料在燃燒之後所殘餘的物質。
In agriculture, a field is an area of land, enclosed or otherwise, used for agricultural purposes such as cultivating crops or as a paddock or other enclosure for livestock.