Heat

Question 1

Degree of freedom (f)

Answer 1

Degree of freedom indicates that in how many direction a body can move is called degree of freedom.
•Monoatomic => f=3 (translatory)
•Diatomic => f=5 (3 translatory, 2
rotational)
•Triatomic => 7/6 (linear [7] Eg.CO2 & nonlinear [6] Eg. H2O)

Question 2

Note:

Answer 2

-First consider an isolated system
-That is which does no external energy and there is no flow of heat
-Then for any process taking place in such a system Δw - ΔQ= 0and u2- u1=0 or Δu= 0, which says that the internal energy of a system remains constant
-this is the most general statement of the conservation of energy
-the internal energy of an isolated system cannot be changed by any process (technical electrical chemical or biological) taking place within the system
-the energy of a system can be only changed by a flow of heat across is boundary or by the performance of work