## What does the first law of thermodynamics say?

The laws of thermodynamics are deceptively simple to state, but they are far-reaching in their consequences. The first law asserts that if heat is recognized as a form of energy, then the total energy of a system plus its surroundings is conserved; in other words, the total energy of the universe remains constant.

What is 1st corollary of 1st Law of Thermodynamics?

Corollary 1 : (First Law for a process). There exists a property of a closed system, the change in the value of this property during a process is given by the difference between heat supplied and work done.

Which is correct form of first law of TD?

The first law of thermodynamics states that energy can neither be created nor destroyed, only altered in form. For any system, energy transfer is associated with mass crossing the control boundary, external work, or heat transfer across the boundary. These produce a change of stored energy within the control volume.

### What is the 2nd law of thermodynamics in simple terms?

The second law of thermodynamics means hot things always cool unless you do something to stop them. It expresses a fundamental and simple truth about the universe: that disorder, characterised as a quantity known as entropy, always increases.

Why is the 1st law of thermodynamics important?

The first law of thermodynamics, arguably the most important, is an expression of the principle of conservation of energy. Consistent with this principle, the first law expresses that energy can be transformed (i.e. changed from one form to another), but cannot be created or destroyed.

What is first law of thermodynamics PDF?

The first law of thermodynamics states that the total energy of a system remains constant, even if it is converted from one form to another.

#### How do you prove the first law of thermodynamics?

The first law of thermodynamics is given as ΔU = Q − W, where ΔU is the change in internal energy of a system, Q is the net heat transfer (the sum of all heat transfer into and out of the system), and W is the net work done (the sum of all work done on or by the system).

Why is CP is greater than CV?

At constant pressure, when a gas is heated, work is done to overcome the pressure and there is an expansion in the volume with an increase in the internal energy of the system. Therefore, it can be said that Cp is greater than Cv.

Who wrote the first law of thermodynamics?

Rudolf Clausius
The first explicit statement of the first law of thermodynamics, by Rudolf Clausius in 1850, referred to cyclic thermodynamic processes.