The pressure p of a gas is given by the expression log p = 21.6–2420/T, where T is the temperature in kelvins. Using the exact value of p from this expression, at T = 400 K, and the Taylor-series expansion for p(T), compute the pressures at 410, 420, and 450 K. Compare these values with the exact ones obtained from the given expression

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?