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First law of thermodynamics incorporates the law of a) conservation of energy b)conservation of heat c)conservation of work d) equivalence of heat and work which ones and why.?

First law of thermodynamics incorporates the law of
a) conservation of energy
b)conservation of heat
c)conservation of work
d) equivalence of heat and work
which ones and why.?

Grade:12

2 Answers

Rinkoo Gupta
askIITians Faculty 80 Points
8 years ago

  1. First Law of Thermodynamics(VW, S & B: 2.6)

    1. There exists for every system a property called energy.E = internal energy (arising from molecular motion - primarily a function of temperature) + kinetic energy + potential energy + chemical energy

        1. Defines a useful property called "energy".

        2. The two new terms in the equation (compared to what you have seen in physics and dynamics, for example) are the internal energy and the chemical energy. For most situtations in this class, we will neglect the chemical energy.

        3. Let’s focus on the internal energy, u. It is associated with the random or disorganized motion of the particles.

        u is a function of the state of the system. Thus u = u (p, T), or u = u (p, v), or u = u(v,T). Recall that for pure substances the entire state of the system is specified if anytwoproperties are specified. We will discuss the equations that relate the internal energy to these other variables later in the class.

      1. The change in energy of a system is equal to the difference between the heatadded tothe system and the workdone bythe system. (This tells what the property energy is useful for.)(VW, S & B: Chapter 5)

        2. DE = Q - W (units are Joules)

        Thanks & Regards
        Rinkoo Gupta
        AskIITians Faculty
a
18 Points
8 years ago
a) conservation of energy

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