Show Bubble in a Sapphire Th re li Is exhibIted In tn the British nn- nn an a a anil mi weighing nine carats I- I 10 ltd tinning a bubble that appears 1 I. I 11 with changes It of tern tem th the r 11 ts believed belle that a cavity In to Im I'm II a quantity of or cat car rv Ih i ph Ihl h Il id t ns as under uder great Brent pressure Tr r. r temperature Is III such Kuch as to tori tow u w the tr ri o II critical point L Ir tiA l I un nu kr r the particular pres- pres i t 1 hil It II Is subjected In Its brilliant prison tiou hou t a It liquefies s and I becomes visible as a Ii bubble |