Biology

Entropy is:

• It is denoted by S.
• It is a state function and ΔS is independent of path.
• Entropy is a measure of the degree of randomness or disorder in a system.
• Greater the disorder of a system, the higher is the entropy. The decrease of regularity in structure means increase in entropy.
• Crystalline solid is the state of lowest entropy (most ordered) and the gaseous state is a state of highest entropy.
• As the temperature increases, randomness increases, and thus, entropy increases.
• For a reversible reaction, entropy change (ΔS)
• (for a reversible reaction)
• At equilibrium, ΔS = 0
• Entropy of a spontaneous reaction increases till it reaches the maximum, and at equilibrium, ΔS = 0
• Entropy is a state property. Therefore, entropy change for a reversible process is given byFor reversible and irreversible isothermal expansion of an ideal gas (that is under isothermal conditions), ΔU = 0. But is not zero for the irreversible process.

Main definition are stated according to http://wiki.answers.com/Q/FAQ/8454.Thermodynamics is the study of energy conversion between heat and mechanical work which leads to the macroscopic properties such as temperature, volume, and...