Thermodynamics - CH 3

Ideal gas

It is ideal only in the sense that it conforms to the simple perfect gas laws.

Boyle’s Law

If the temperature of a given quantity of gas is held constant, the volume of gas varies inversely with the absolute pressure during a change of state.

Charles’ Law (1)

If the pressure on a particular quantity of gas is held constant, then, with any change of state, the volume will vary directly as the absolute temperature.

Charles’ Law (2)

If the volume of a particular quantity of gas is held constant, the, change of state, the pressure will vary directly as the absolute temperature.

Combining Boyle's and Charles' laws, what is it called?

Equation of State or Characteristic Equation of a Perfect Gas

Specific Heat

The specific heat of a substance is defined as the quantity of heat required to change the temperature of unit mass through one degree.

Internal Energy of an Ideal Gas (U, u)

Joule's law states that "the change of internal energy of an ideal gas is a function of only the temperature change."

Entropy (S, s)

Entropy is that property of a substance which remains constant if no heat enters or leaves the substance, while it does work or alters its volume, but which increases or diminishes should a small amount of heat enter or leave.

What does Heat represent?

"The area under the curve of the process on the TS" plane.