Laws of Thermodynamics

 Thermodynamic:

Thermodynamics deals with the concepts of heat and temperature and the inter-conversion of heat and other forms of energy. Thermodynamics is a macroscopic science. This means that it deals with the bulk system and does not deal with the molecular constitution of matter.

e:g: Thermodynamics is involved in the study of different types of power plants such as nuclear power plants, thermal power plants

Thermodynamics Laws:

Thermodynamics laws define the fundamental physical quantities like energy, temperature and entropy that characterize thermodynamic systems at thermal equilibrium. These thermodynamics laws represent how these quantities behave under various circumstances.

• First law of thermodynamics: Energy can neither be created nor be destroyed, it can only be transferred from one form to another.
  
  
  
• Second law of thermodynamics: The entropy of any isolated system always increases.
  
  
  
• Third law of thermodynamics: The entropy of a system approaches a constant value as the temperature approaches absolute zero. e:g  When the ice is cooled to absolute zero, ideally, the entropy should be zero. But in reality, it is impossible to cool any substance to zero.
  
  
  
• Zeroth law of thermodynamics: If two thermodynamic systems are in thermal equilibrium with a third system separately, then they are in thermal equilibrium with each other.
  
  
  

→ Entropy is the measure of the number of possible arrangements the atoms in a system can have.
→ Enthalpy is the measurement of energy in a thermodynamic system.