Properties Of Substance Flashcards
What is needed to define the thermodynamic state of a substance?
The thermodynamic state of a substance is defined by two or more independent thermodynamic properties.
What are all the independent thermodynamic properties of a substance?
Pressure, temperature, specific volume, specific internal energy, specific enthalpy, and specific entropy.
What is a subcooled liquid?
A liquid that can absorb energy without vaporizing. (A liquid not at its boiling point.)
When is a substance in the subcooled liquid phase?
A substance is in the subcooled liquid phase if its temperature is less than its saturation temperature corresponding to its pressure and if it’s pressure is greater than its saturation pressure corresponding to its temperature.
What is a saturated liquid?
A liquid that has absorbed as much energy as it can without vaporizing (A liquid at its boiling point).
What is a liquid vapor mixture?
A substance whose liquid and vapor phases are coexisting at the same temperature and pressure.
When is a substance in the liquid vapor phase?
A substance is in the liquid vapor phase when it’s pressure is equal to its saturation pressure corresponding to its temperature and when it’s temperature is equal to its saturation temperature corresponding to its pressure.
What is a saturated vapor?
A vapor that can no longer lose energy without condensing.
What is a superheated vapor?
A vapor that has absorbed more than is needed to just vaporize it.
When is a substance in the superheated phase?
A substance is in the superheated phase when it’s temperature is greater than its saturation temperature corresponding to its pressure and when it’s pressure is less than its saturation pressure corresponding to it’s temperature.
What is an ideal gas?
A gas whose molecules do not interact. Usually a gas with very low pressure or temperature that is much higher than its critical temperature.
What is a perfect gas?
An ideal gas whose specific heats are constant.
What is a real gas?
A gas whose molecules interact with each other (Especially true for gases at low temperatures).
What is the triple point of a substance?
A state at which solid, liquid and gaseous phases can coexist.
What are intensive properties?
Properties independent of the amount of substance present.
What are extensive properties?
Properties dependent on the amount of substance present.