D=d―1.04×1.25 =12―1.3 =10.70(㎜) 孔直徑為10.70(㎜);
汽包的絕對(duì)壓力P絕=P表+P大氣(50%) =9.807+0.09732 =9.904MPa 汽包的絕對(duì)壓力9.904MPa。