Thermodynamics and Thermodynamics laws - First law of thermodynamics - Zeroth law of thermodynamics

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Thermodynamics and Thermodynamics laws


                  Heat and temperature play a vital role in our daily life. We should study about heat and thermodynamics because of thermodynamics is used to apply mechanical engineering. When an object at higher temperature is placed in contact with another object at lower temperature, the flow of energy from the object at higher temperature to lower temperature, this energy transfer is called heat. Usually temperature measured in Celsius (oC) and Fahrenheit (oF) scale but the SI unit of temperature is Kelvin (K).





First law of Thermodynamics  

           Thermodynamics laws are used to understand about engines. This first law of thermodynamics is a statement of the law of conservation of energy. This conservation of energy usually involves kinetic energy and potential energy of bulk objects.





Change in internal energy (∆U) of the system is equal to heat supplied to the system (Q) is subtracted the work done by the system (W).

∆U = Q – W

·       If heat flows into the system the internal energy will increase.

·       If heat flows out of the system the internal energy will decrease.

·       If work is done on the system the internal energy will increases.

·       If work is done by the system the internal energy will decreases.




Zeroth law of Thermodynamics 

While we read this zeroth law of thermodynamics we think about why? This name is suit for the thermodynamics law. The reason is scientists were found that first law of thermodynamics and next they found this law but this law is very basic for first law of thermodynamics so that scientist named that zeroth law of thermodynamics.  

This law states that, If two systems, A and B are in thermal equilibrium with a third system C. then A and B are in thermal equilibrium with each other.



Consider three system like A, B and C which are initially at different temperature. For understand this zeroth law we assume that system A and B are not contact with each other. But system C is thermal contact with each other. This consideration system A and B will be thermal equilibrium with system C. Finally three systems are at thermal equilibrium there will be no heat flow between them as they are at the same temperature. This law is used to measure temperature of human body.




       This law enables us to determine the temperature of the any system.  For instance, when a thermometer is kept in contact with a human body, it reaches thermal equilibrium with the body. Which means temperature of thermometer will be same as the human body. So that mercury or indicates temperature level at remaining some time.  

Thermodynamics and Thermodynamics laws - First law of thermodynamics - Zeroth law of thermodynamics Thermodynamics and Thermodynamics laws - First law of thermodynamics - Zeroth law of thermodynamics    Reviewed by knowledge people creators on January 29, 2019 Rating: 5
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