00:01
Students let me explain to the question here we have to determine the change in entropy change in entropy for a reversible reversible isothermal expansion of gas isothermal expansion of gas it obeys the redic wong equation riddick -wong equation of state, equation of state, that is, t is equal to nrt divided by v by n v minus nb minus n squared a divided by square root of t v into v plus nb.
00:54
So it is given by.
00:55
So here we have, so first of all, i want to tell you what is meant by all these terms.
01:01
That means change in entropy, isothermal expansion of gas, then you will enter into the solution.
01:07
So first is change in entropy.
01:10
Entropy, it is nothing but it is a measure of disorderness or randomness of a system.
01:17
So what is meant by change in entropy? change in entropy, nothing but change in the measure of disorderness of randomness of a system.
01:28
Coming to the isothermal expansion of gas, isothermal, iso -thermal, iso means same.
01:35
Thermal means temperature.
01:39
So that means here expansion of gas at constant temperature.
01:45
So expansion of gas, expansion of gas at constant temperature.
01:54
Again as weight of an object mass, against weight of object, moss on the piston, on the piston.
02:11
That is isothermal expansion of gas...