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Thermodynamics Udit Gupta
Welcome to the 1st lesson! TODAY WE LEARN ABOUT ASSUMPTIONS IN KTG DON'T FORGET TO CHECK THE SPECIAL CLASSES& PLUS COURSE! Apos Other bookom unacademy Home minus oday Serch Coss Topis&Educa Browse Courses Railway Examinations Class 12 NTA-UGC NET GATE(iv RPSC CTETMPSC SSC CGL IT JEE Exams CAT UPSC CSE GATE (CS and IT CDS NDA/ AFCAT IIT JEE Crash Course on Physics through 750 Important Questions Last date to apply is 29th Oct Soil, Classification and Distribution Exam Oriented Discussion on Numbers and Operation Understanding Fluid Flow through Top Festivais and Fairs of Rajasthan Rgon 200 PM 21 7,500 egstto 1200 21 t Udit Gupta
Assumptions in KTG All gases consist of molecules which are considered as rigid,perfectly elastic,_solid spheres. These molecules are extremely small i.e., the volume occupied by the molecules of the gas is taken negligible as compared to the volume of the containing vessel.
Assumptions in KTG The molecules are in a continuous random motion. They are moving in all directions with all possible velocities. There is no particular direction of motion of the particles.
Assumptions in KTG The molecules during their motion collide with one another and also with the walls of the vessel. At each collision, their velocities change in both magnitude as well as direction; however in the steady state, molecular density remains uniform throughout the gas and does not change with time. rll
Assumptions in KTG No forces of attraction or repulsion are exerted on a gas molecule by other molecules or by the container except during collisions. This means, the energy of the gas is purely kinetic. The collisions among the molecules or with the walls of container are purely elastic. A collision is said to be perfectly elastic if the energy of the molecules remain same before and after the collision.
Assumptions in KTG Molecules travel in a straight line with a uniform velocity in between the collisions. The average distance travelled by the molecules between the successive collisions is called as mean free path of a molecule. The time spent during a collision is assumed to be negligibly small as compared with the time taken by the molecule in traversing a mean- free path.
Real/Ideal Gas . A gas which satisfies all set of assumptions of KTG under all conditions of temperature and pressure is called an ideal or perfect gas, A real gas shows appreciable deviations from the perfect gas. At low temperature and high pressure, gases show deviation from the ideal behavior.
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