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等壓線是氣象人員將每日來自世界各地氣象站， 同一時間所觀測得之氣壓，填在標有氣象站位置的地圖上，然後把氣壓數值相同之氣象站以鉛筆連接起來的線[1]。等壓線配置形勢可清楚表示地球表面上高低氣壓的位置及分布，且可用來推斷風的情況。[2]等壓線每一間隔距離一般為2或4百帕斯卡。[3]
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