Properties of Pure Substances

Question 1

What is a Pure Substance?

Answer 1

Has a fixed chemical composition through out various processes

Question 2

What is the Saturation Pressure?

Answer 2

The phase-change pressure for a pure substance and given temperature

Question 3

What is Saturation Temperature?

Answer 3

The phase-change temperature for a pure substance and given pressure

Question 4

Enthalpy, H=

h=

Answer 4

U+PV
u+Pv

u=internal energy

Question 5

What is Quality, x?

Answer 5

A property of a fluid where we need to know the proportions of the liquid and vapour phases

Question 6

What is a Compressed Liquid?

Answer 6

They can be approximated as a saturated liquid at the given temperature. The properties depend more on temperature than pressure

Question 7

For a Super-heated Vapour, what are no longer dependent variables?

Answer 7

Pressure and temperature. It is a single phase substance

Question 8

What is the Equation of State?

Answer 8

Any equation that relates the pressure, temperature and specific volume of a substance

Question 9

What is the Compressibility Factor?

Answer 9

It is a correction factor and is a measure of deviation from ideal-gas behaviour

z=PV/RT