(1)水沸腾冒“白气”经历了先汽化后液化的过程
(2)Q 吸=cm(t﹣t 0)=4.2×10 3J/(kg·℃)×1kg×(100℃﹣20℃)=3.36×10 5J
Q 放=W=pt=1500W×240s=3.6×10 5J
η=
×100%=
×100%=93.3%
(1)水沸腾冒“白气”经历了先汽化后液化的过程
(2)Q 吸=cm(t﹣t 0)=4.2×10 3J/(kg·℃)×1kg×(100℃﹣20℃)=3.36×10 5J
Q 放=W=pt=1500W×240s=3.6×10 5J
η=
×100%=
×100%=93.3%