Difference between Free Expansion of a Gas and Isothermal Expansion

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Free expansion of a gas Isothermal expansion of gas

1)It is the unrestrained expansion of a gas into a volume. 1)It is the restrained expansion of a gas into a volume.

2)The workdone in free expansion is equal to zero. 2)The workdone in isothermal expansion is not zero.

3)The external pressure is zero. 3)The pressure is constant.

4)It is an irreversible process. 4)It is a reversible process.

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T_{1}

T_{2}

T_{1} < T_{2}

T = 0

T \neq 0

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1)It is the unrestrained expansion of a gas into a volume.	1)It is the restrained expansion of a gas into a volume.
2)The workdone in free expansion is equal to zero.	2)The workdone in isothermal expansion is not zero.
3)The external pressure is zero.	3)The pressure is constant.
4)It is an irreversible process.	4)It is a reversible process.