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Question

Define the following:

  1. spontaneous process
  2. entropy
  3. positional probability
  4. system
  5. surroundings
  6. universe

Solution Preview

(a) Spontaneous Process:

A process which is capable of proceeding in a particular direction without any external source of energy. Spontaneity of a process determines whether a process can occur or not.

(b) Entropy:

Entropy is a measure of molecular randomness or disorder. It describes the positions or energy levels available to a system in a given state. It is an important part of thermodynamics which describes the disorganized energy of a system.

(c) Positional Probability

It is the probability of occurrence of particular arrangement of a given state and it depends upon the number of arrangements in space.

(d) System

That part of universe which is under observation or analysis is a system.

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