An aluminium alloy plate 0.2m2 surface area (both sides), 4 mm thick and at z00 °c is suddenly quenched into liquid oxygen which is at -183 °c. find the time required for the plate to reach the temperature of -70 °c. take p-2700 kg/m3, c 890 j/kg °c, h=370 w/m2°c).

High-pressure liquid chromatography (hplc) is a method used in chemistry and biochemistry to purify chemical substances. the pressures used in this procedure range from around 500 kilopascals (500,000 pa) to about 60,000 kpa (60,000,000 pa). it is often convenient to know the pressure in torr. if an hplc procedure is running at a pressure of 1.03×108 pa , what is its running pressure in torr?