thermodynamic Process

Compression of gas is a thermodynamic process, and can be done in many ways; some of them are listed below.

• Isobaric Process – a process wherein pressure remains constant.
• Isothermal Process – a process in which there os no change in temperature.
• Isentropic Process – a process in which there is no change in entropy.
• Adiabatic Process – a process during which there is no external exchange of heat. PVk = Constant
• Polytropic Process – a process for perfect gases, follows the law PVn = Constant n=1 for isothermal process.

basic gas laws

First Law of Thermodynamics: Energy is neither created nor destroyed, but can be converted from one form to another form.

Second Law of Thermodynamics: Energy, which exists at various levels, is available for use only if it can move from a higher to a lower level.

Ideal or Perfect Gas Laws

Gases may consist of one specific gas or may be constituent of number of gases. An ideal or perfect gas is one, which obeys below mentioned Boyle’s Law and Charle’s Law. Perfect gases do not exist in practice.

Boyle’s Law – states that at a constant temperature, the volume of an ideal gas decreases with increase in pressure.

P1V1 = P2V2 = CONSTANT

Charle’s Law – states that at constant pressure, the volume of an ideal gas will increase as the temperature increases.

V1/T1=V2/T2=CONSTANT

Amonton’s Law – states that at constant volume, the pressure of an ideal gas will increase as the temperature increases.

P1/T1=P2/T2=CONSTANT

Avagadro’s Law – states that equal volume of gas under same condition of temperature and pressure contains same number of molecules.