LESSON 1- Basic Thermodynamics Presented By- Dheeraj Kumar Follow me on unacademy.com/user/dheeraj.k1994
INTRODUCTION TO THERMODYNAMICS Meaning of thermodynamics Microscopic and Macroscopic approach Systems and Control volume Thermodynamics Properties, Process and cycles . Quasi-Static Process Thermodynamic Equilibrium
Meaning of Thermodynamics Thermodynamics derived from two words 'Thermo' meaning 'Heat' and 'Dynamics' meaning 'Motion'. Thus it is a science of energy transfer in form of heat and its effect on the physical properties of the substances. The applications of thermodynamics laws found use in all fields of energy technology like steam and nuclear power plant, IC Engines, gas turbines etc.
Microscopic and Macroscopic approach Macroscopic approach Microscopic approach Certain quantity of matter is considered without taking it at molecular level. Matter is considered at molecular level and all events taking place happens in molecular level. Events occurs due to actions of many molecules and can be perceived by human senses. Events occurs due action of single molecules or atom and cannot be perceived by human senses. These includes pressure, momentum etc. These includes position, velocity, energy etc.
Systems and Control Volume * Systems:- Any quantity of matter or region in space on which attention is concentrated called as systems. The region other than the systems from observation is being taken place is called as surroundings. Systems and surroundings are separated from each other by a thin layer called as boundary Systems and surroundings together forms the universe.
Universe = System + Surroundings System (flask, contents) OR Surroundings OR Surroundings (flask and subtances in contact with outside System (contents) of flask) Systems and Surrounding
Types of Systems Open,Closed,Isolated System:s Matter (water vapor) Heat Heat -Heat Open Heat system Closed system Isolated system
icontrol i volume Controi voiume In open systems such as in air compressors, attention is focussed on a certain volume. This volume is called as control volume, bounded by a surface called as control surface
Thermodynamics Propertie:s Extensive Properties Intensive properties Depends on mass. Examples are volume, energy, heat capacity etc. Macroscopic in nature. Independent of mass. Examples are pressure, temperature, density etc. Macroscopic in nature.
Physical condition of a system define by the certain characteristics, these characteristics are called as properties. When all the properties of a systems have definite value, then Operation or changes in any properties of the systems leads . The succession of states passed through during a change of . When path is completely defined, it is called as process. this is called as state of the system. to change of state. state called as path. When the initial and final position of a state of the system is same then it is called as cycle.
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