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  1. Do not mix up the unit of pound ( lb) and pound-force ( lbf). The former is a unit for mass, whereas the latter is a unit for force. The corresponding units in SI are kg and kgf, which are well konwn to physics students...

  2. ...的多270倍。估算溫室氣體排放量常以百萬公噸碳當量(millions of metric tons of carbon equivalents, MMTCE)為 單位 ,亦即以其GWP值 (Global Warming Potential)計算...

  3. ...冷噸」來表達. 一「冷噸」的定義為:冷卻一「短噸」 ( short ton ,等於 2000 磅或者907 千克)的冰用24小時的時間來溶解所需要的製冷功率。它等於12,000 英熱 單位 /小時 或 3510 瓦(http://physics.nist.gov/Pubs...