What is the smallest temperature in degrees Fahrenheit you can have? Rankine?

Is the exergy equation independent of the energy and entropy equations? 

If I heat some cold liquid water to To, do I increase its availability? 

Are reversible work and availability (exergy) connected? 

Consider availability (exergy) associated with a flow. The total exergy is based on the thermodynamic state, the kinetic and potential energies. Can they all be negative?  

A windmill produces power on a shaft taking kinetic energy out of the wind. Is it a heat engine? Is it a perpetual machine? Explain. 

 A U–tube manometer using mercury shows that the gas pressure inside a tank is 30cm. Calculate the gauge pressure of the gas inside the vessel. Take g = 9.78m/s², density of mercury =13,550kg/m³.

Define thermodynamics. Justify that it is the science to compute energy, energy and entropy.

The gas used in a gas engine trial was tested. The pressure of gas supply is 10cm of water column. Find absolute pressure of the gas if the barometric pressure is 760mm of Hg.

Define different types of properties?