A mercury thermometer is placed in a oil well for the measurement of temperature in a pipe. The well is made of steel (k = 50 W/m°C) and is 14 cm in length and 1.0 mm in thickness. The temperature...

A mercury thermometer is placed in a oil well for the measurement of temperature in a pipe. The well is made of steel (k = 50 W/m°C) and is 14 cm in length and 1.0 mm in thickness. The temperature recorded by well is 100°C while pipe wall temperature is 50°C. If the heat transfer coefficient between the air and well wall is 30 W/m2°C, calculate the true temperature of air.