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Kinetic Theory Of Gases (Thermodynamics (2nd Law (Mechanical Work complete…
Kinetic Theory Of Gases
Ideal Gas
Assumptions
Nature
Large number of tiny particles - molecules
rigid & perfectly elastic
same shape,size,mass
Actual volume << occupied volume
Random Motion
all directions & all velocities
collide with each other & walls. collisions = perfectly elastic
b/w 2 collisions straight line constant velocity = free path
time for collisions << time to travel free path
Maxwell Distribution Curve
Thermodynamics
0th Law
If P=Q & P=R then Q=R
1st Law
ΔQ=ΔU+ΔW
2nd Law
Mechanical Work complete conversion to heat
but heat can not be completely converted to mechanical work
Heat Engines
Refrigerators
Absorption, Reflection & Transmission of Heat Radiation
Coeff of Absorption
energy absorbed/energy incident
PBB a=1 & ordinary a<1
Coeff of Reflection
energy reflected/energy incident
Coeff of Transmission
energy transmissited/energy incident
good reflector=bad absorber
Athermanous
do not transmit incident heat radiations
Diathermanous
transparent to heat radiations
PBB
Absorbs all radiations
lampblack=98%
FBB