El volumen de una muestra de oxígeno es 2.5 litros a 50 °C. ¿Qué volumen en m3 ocupará el gas a 25°C, si la presión permanece constante? La temperatura de una muestra de oxigeno es de 45 °C y ocupa un volumen de 55 L.

¿Qué temperatura en °K tendrá cuando el volumen aumenta a 80 L?

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?