Saturday, 8 August 2015

CLASS NOTE : THERMODYNAMICS

      THERMODYNAMICS (STP213).
The first class held last week (29/7/2015)  and it was quite a boring class. The lecturer discussed about THERMODYNAMICS and it's FIRST LAW.
   Thermodynamics is defined as the conversion of heat energy into work .It is found in cars, refrigerators, grinding machines, A.C etc.
    A thermodynamics system is a collection of matter or substance surrounded by a boundary which separates it from its surroundings . Examples  are: petrol engine, stem turbine power plants, steam engine etc.
    THE FIRST LAW O. States that, the more quantity of heat applied to the system is equal to the quantity of work done.
        Q = U+W.; dQ = dU + dW
   
          POINTS TO NOTE:
* Internal Energy is defined as the sum of P. E and K. E in the system.
* Q is negative when heat flows out of the system and positive when heat flows into the the system.
* W is positive when the system does work and negative when work is done on the system.
* Thermodynamic processes are: Isothermic, Isobaric, Isovolumic/Isochronic, and Adiabatic process.
- Isothermic: It takes place at constant temperature while pressure and volume varies.
- Isochronic: It takes place at constant volume while temperature changes.
- Isobaric: It takes place at constant pressure while there is a change in volume.
-Adiabatic: There is no heat allowed to flow in and out of the system. It is coated or insulated. It's insulating materials  are asbestos or fire bricks. The quantity of Q is 0.
  Then he gave us an assignment which will be submitted next week
THERMODYNAMICS

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