Is work done in free expansion zero?

Since external pressure is zero, the work done during the free expansion is zero. So the correct answer to the question is option (B)-Zero. Also according to the first law of thermodynamics, when work done and change in internal energy is zero, the heat released or absorbed is zero.

What is the work done in free expansion of a gas?

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During free expansion of an ideal gas, the work done is 0 be it a reversible or irreversible process. Where ∆U represents the change in internal energy, q is the heat given by the system and w is the work done on the system.

Why is there no work done in free expansion?

As P is zero in free expansion process, Work done is also zero. Work done = zero because , free expansion is a irreversible adiabatic and isothermal process . Due to isothermal , there is no temperature change and hence no internal energy change occur.

Is the work done by the gas positive negative or zero explain?

Positive work is done on the gas when the gas is compressed; negative work is done on the gas when the gas expands. zero work is done on the gas when the gas volume is fixed.

Why the work done obtained in expansion of gas in vacuum is zero?

A free expansion means expansion against zero opposing force. When the gas expands in a vacuum, there is no opposing force, that is, Pext = 0. The work done by a system during such expansion is W = – Pext ∆V = 0. Thus, work done in a vacuum is zero.

What is the value of work done in an expansion of gas in vacuum?

Also,there is nothing that the gas has to overcome its pressure to expand,so the work it does in expanding is zero.

What is free expansion What is the work done during the expansion of?

Answer: During free expansion of an ideal gas, the work done is 0 be it a reversible or irreversible process. Where ∆U represents the change in internal energy, q is the heat given by the system and w is the work done on the system.

What is the work done?

Overview of Work, Energy and Power

Is expansion of a gas positive or negative work?

The work done by a gas expanding against an external pressure is therefore negative, corresponding to work done by a system on its surroundings. Conversely, when a gas is compressed by an external pressure, ΔV < 0 and the work is positive because work is being done on a system by its surroundings.

Why is work done by gas negative?

When the gas expands against an external pressure, the gas has to transfer some energy to the surroundings. Thus, the negative work decreases the overall energy of the gas. When the gas is compressed, energy is transferred to the gas so the energy of the gas increases due to positive work.

What happens in free expansion?

A free expansion is an irreversible process in which a gas expands into an insulated evacuated chamber. It is also called the Joule expansion. During the free expansion, the temperature remains constant this implies there is a drop in the pressure. Work done in a free expansion process is zero.

What is work done by gas?

For a gas, work is the product of the pressure p and the volume V during a change of volume. On a graph of pressure versus volume, the work is the area under the curve that describes how the state is changed from State 1 to State 2.

What is the work done during free expansion of ideal gas?

During free expansion of an ideal gas, the work done is 0 be it a reversible or irreversible process. It is known that the change in internal energy of a system is given as:

What is the difference between isothermal and free expansion?

Isothermal expansion. An isothermal process is a change in the system such that the temperature remains constant. In other words, in isothermal process ∆T = 0. Free expansion of a gas occurs when it is subjected to expansion in a vacuum (p ex =0). During free expansion of an ideal gas, the work done is 0 be it a reversible or irreversible process.

What is the temperature change during free expansion of gas?

In other words, there is no temperature change in the free expansion of an ideal gas. The change in temperature of an non-ideal gas that undergoes free expansion can be written is termed the Joule coefficient. Here, is the molar volume, where is the number of moles of gas in the container. Furthermore, and .

What is the difference between free expansion and reversible expansion?

The overall result when we have restored the system to the initial state, however, is quite different for the reversible expansion than for the free expansion. For the reversible expansion, the work we need to do on the system to compress it has the same magnitude as the work we received during the expansion process.