Interesting Thermodynamics

 Thermodynamics is considered to be one of the most difficult subjects…

But it has lot of interesting information, particularly about things dealing with our day today life…

We speak a lot about temperatures… “Today is a bit hotter”… “The temperature made me shiver yesterday”… “There is lot of humidity in air”… “The food inside refrigerator froze, due to cooler settings”… “Decrease the temperature of AC… It’s sweating inside here”…

Knowingly or unknowingly, whenever u say these sorts of things, u r speaking thermodynamics… It deals with all the things related with temperatures… Heating, cooling, humidifying, etc…

The main reason why we learn Thermodynamics is Human comfort….

We can’t survive at a temperature of 50 degree Celsius… Nor can we go out at 4 degree Celsius without wearing a woolen dress…

I read a few interesting things…

All of us know the principle of Refrigerator… It takes the heat from inside and gives it outside, so that the interior remains cool…

Now think of keeping a refrigerator in a fully isolated room… All the windows, doors r covered… No heat enters or leaves the room… Now let’s open the refrigerator’s door…

So, what happens is the coolness of the refrigerator is spread throughout the room and the room gets cooler… Right?

If u say it is right, u r wrong…  Friends, u should note one thing; the refrigerator absorbs heat from inside and gives outside… Initially, the coolness is spread… But then, the refrigerator starts to absorb heat from inside and gives it outside… Since, the room is insulated heat can’t be given out anywhere… Also, no machine is 100% efficient… Some heat is dissipated from the machine itself… So actually, the room gets hotter and not colder…

How does an Air Conditioner work? The same principle of a refrigerator, except that it absorbs the hotness of a whole room and gives it out, reducing the temperature of a room…

Consider u r in a room where the temperature is just 4 degree Celsius… U need to increase the temperature or u will freeze… All that u have is an AC… What will u do?

Simple… Reverse the AC… So that the AC absorbs heat from outside and gives it inside… It’s like cooling the outside…

We use fan inside a CPU to decrease the temperature… That is nothing but Thermodynamics again…

Even a small temperature rise can melt the glaciers, ice bergs and change the climatic cycles… Thermodynamics again…

There r lot of things interesting like this in Thermodynamics… We need to think about all those things… 

P.S: I took some of the above info from "thermodynamics" written by Cengel, Boles and the book is published by Tata McGraw Hill...