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PMM1 AND PMM2 PERPETUAL MOTION MACHINES

We have discussed First law of thermodynamics and second law of thermodynamics in our previous post, where we have also seen the limitations of first law of thermodynamics. Today we will try to understand the perpetual motion machine of first and second kind in this post and after that we will discuss the third law of thermodynamics.

Perpetual motion machine of first kind (PMM1)

Perpetual motion machine of first kind does not exist because such machines violate the first law of thermodynamics. Such machines will produce the energy by itself and as we know that according to the law of  energy conservation, energy could not be created or destroyed but could be converted from one form of energy to other form of energy.

Therefore, a machine that does not follow the first law of thermodynamics or law of conservation of energy could be termed as perpetual motion machine of first kind i.e. PMM1

Figure showing below a graphical representation of PMM1


Perpetual motion machine of second kind (PMM2)

Perpetual motion machines of second kind are those machines that violate the second law of thermodynamics because such machines will absorb continuously heat energy from a single thermal reservoir and will convert the absorbed heat energy completely in to work energy. 

Such machines will have efficiency 100%, or we can say that perpetual motion machines of second kind will have higher efficiency than ideal Carnot cycle and in my opinion, it is not possible.

Therefore, we can say that perpetual motion machine of second kind will also does not exist as such machines violate the second law of thermodynamics.

Figure showing below a graphical representation of PMM2


Do you have suggestions? Please write in comment box

We will start our discussion with Zeroth law of thermodynamics in next post.

Reference:
Engineering thermodynamics, by R.K Rajput
Engineering thermodynamics, by P.K Nag

Image courtesy: google

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