In: Physics
For physics discussion post. Please TYPE the response as I struggle with reading written information.
Firstly I will start from ideal gas equation.
So ideal gas equation is : pv = nRT
Where p is pressure , v is volume, n is no of mole of a gas. R is gas constant . T is temperature.
Now
Boyle's law:
At constant temperature, pressure is inversely proportional to the volume. So if temp is constant then if we compress the gas by decreasing volume then it will exert more pressure.
From above pv =nRT equation, if temp is constant and no of moles are constant then p will inversely proportional to volume.
Charle's law:
In charle law we talk about constant pressure. So if pressure remains constant and we increase the volume then the temperature will also increase. Because volume is directly proportional to temperature at constant pressure.
KTG : kinetic moleculer theory of gas
In ktg we understand the motion of gas particles in a closed vassel, we increase or decrease volume at constant pressure and try to find out their speed in different situations. We assume that the distance between gas particles are much higher than the size of a molecule. So we neglect the radius of a molecule when we derive the equations. We assume that the molecules travel in straight line until they collide each other And the time of collision is negligible. By keeping these assumptions in mind we find that the kinetic energy of molecules is directly proportional to absolute temperature.
FIRST LAW OF THERMODYNAMICS.
If we supply heat to the gas, then if we remove the work done by the gas from the supplied heat then this remaining quantity will itself is the change in internal energy of the gas
That is. dQ= dW + dU
So thermodynamic subjects to the principle of conversion of energy.