Aniline point of the diesel is a measure of its ________ content?

In actual operation of a bubble cap distillation tower, the ________ at the bottom of the tower is more than that at the top of the tower?

Temperature profile in steady state heat transfer is________?

Soap cannot be used with hard water, because ________?

Maximum thermal efficiency of boiler may be about ________ percent?

Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately?