Physics: THERMODYNAMICS
Thermodynamics is as important in study of physics as other concepts and principles are. Thermodynamics teaches us the effect of the change in pressure, temperature, volume, air on various physical systems. It is also concerned with transfer of heat energy from one object to another or from one environment to other.
The steam engines invented in the past are based on the principles of thermodynamics. There are various laws in thermodynamics and that helps you to understand different processes in physics. The laws of thermodynamics explains that energy can be exchanged and among the different physical systems in the form of work or heat. Another process called entropy is also a defined using the principle of thermodynamics. For example, it explains how hot tea becomes cold after sometime.
The law of thermodynamics divides the surroundings into different environments. The heat is lost from the cup to the surroundings and exchange of the heat takes place until that the inside the cup and the outside environment reaches equilibrium. Transfer of energy in the form of heat keeps on taking place until and unless both the systems that are taking part in the reaction beaches of common point or an equilibrium. The law of thermodynamics states that the exchange of energy keeps on ticking place between different systems until and unless all the systems acquires equilibrium that means then all the systems to gain equal energy that transfer of heat stops taking place.