Oct 222012
 

Gas lawsGas Laws are laws that explain the behaviour of an ideal gas. The following are some of the important gas laws:

  1. Boyle’s law
  2. Charles’ law
  3. Amontons’ law
  4. Joule’s law of internal energy
  5. Regnault’s law
  6. Avogadro’s law

1. Boyle’s Law:

Boyle’s law states that the volume of a given mass of gas (V) is inversely proportional to its absolute pressure (P), provided the temperature of the gas (T) remains constant.

According to Boyle’s law,

V∝{~{1/P}},~when~T~is~Constant

V=~{C/P},~where~C~ right ~Constant

PV=~C

2. Charles’ Law:

According to Charles’ law, the volume of a given mass of gas (V) is directly proportional to its absolute temperature (T), when its pressure remains constant.

Mathematically,

V∝T

{V/T}=~C,~where~C~ right ~constant

3. Amontons’ law (or Gay-Lussac’s Law):

Amontons’ law states that if the volume of a given mass of a gas (V) is kept constant, then the pressure of the gas (P) is directly proportional to its absolute temperature (T).

According to this law,

P∝T,~when~V~is~constant

P~=~CT,~where~C~ right ~Constant

{P/T}~=~C

4. Joule’s Law of Internal Energy:

Joule’s law of internal energy states that the internal energy of a given quantity of gas depends only on its temperature and is independent of its pressure and volume.

i.e, ΔU ∝ T

where ΔU → Change in internal energy

5. Regnault’s Law:

Regnault’s law states that the specific heat capacity of a gas at constant pressure (Cp) and the specific heat capacity of a gas at constant volume (Cv) do not change with change in pressure and temperature. According to this law, Cp and Cv values of a gas remain constant.

6. Avogadro’s Law:

This law states that equal volumes of different perfect gases, at the same temperature and pressure, contain equal number of molecules.

According to Avogadro’s law,

{V/n}~=~Constant

where,

V → Volume of gas

n → Amount of substance of the gas

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I am a mechanical engineer with a passion for technical stuff. I am the founder and former editor-in-chief of Mechteacher.com.