如果氣壓計(jì)壓力為83kpa,試完成以下計(jì)算: (1)絕對(duì)壓力為0.1Mpa1時(shí)的表壓力; (2)真空計(jì)上的讀數(shù)為70kpa時(shí)氣體的絕對(duì)壓力; (3)絕對(duì)壓力為50kpa時(shí)的相應(yīng)真空度(kpa); (4)表壓力為0.25Mpa時(shí)的絕對(duì)壓力(kpa)。
逆流時(shí)的對(duì)數(shù)平均溫差為