# What is the work done by the gas during the adiabatic expansion?

## What is the work done by the gas during the adiabatic expansion?

When an ideal gas is compressed adiabatically (Q=0), work is done on it and its temperature increases; in an adiabatic expansion, the gas does work and its temperature drops.

## When the work is done on the gas in an adiabatic process then the temperature of the gas will be?

For the adiabatic process of gas, the heat is kept zero. In the adiabatic expansion of the gas, the work done by the gas is always positive. Since the work done by the gas is positive the internal energy decreases, so the temperature of the gas also decreases.

Adiabatic expansion is a situation whereby an external work acts upon a system at the expense of utilizing internal energy of the gas and results in lowering the temperature of the molecules of gas. The terms adiabatic refers to the process in which heat energy is neither gained nor lost by a system.

### When a gas expands did the gas do work or was work done on the gas?

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.

### What is ∆ U in adiabatic process?

According to the definition of an adiabatic process, ΔU=wad. Therefore, ΔU = -96.7 J. Calculate the final temperature, the work done, and the change in internal energy when 0.0400 moles of CO at 25.0oC undergoes a reversible adiabatic expansion from 200. L to 800.

Which work done is more adiabatic or isothermal?

Both start from the same point A, but the isothermal process does more work than the adiabatic because heat transfer into the gas takes place to keep its temperature constant. This keeps the pressure higher all along the isothermal path than along the adiabatic path, producing more work.

#### What are the two main characteristics of an ideal gas?

What are the characteristics of an ideal gas?

• The gas molecules are in constant random motion.
• There is no attraction or repulsion between the gas molecules.
• The gas particles are point masses with no volume.
• All the collisions are elastic.
• All gases at a given temperature have the same average kinetic energy.

#### What is adiabatic process example?

An example of an adiabatic process is the vertical flow of air in the atmosphere; air expands and cools as it rises, and contracts and grows warmer as it descends. Another example is when an interstellar gas cloud expands or contracts. Adiabatic changes are usually accompanied by changes in temperature.

Which is true for adiabatic process?

An adiabatic process is defined as a process in which no heat transfer takes place. This does not mean that the temperature is constant, but rather that no heat is transferred into or out from the system. (The actual definition of an isentropic process is an adiabatic, reversible process.)

## Does a gas do work as it expands?

Gases can do work through expansion or compression against a constant external pressure. These increasingly frequent collisions transfer energy to the piston and move it against an external pressure, increasing the overall volume of the gas.

## What happens when gas expands?

As the volume of a gas expands, the overall temperature tends to drop because there are fewer molecules per any given volume. According to the ideal gas law PV=nRT, P=(n/V) RT, the pressure can be constant with decreasing molecular density only with increasing temperature.

How do you know if a system is adiabatic?

Any process that occurs within a container that is a good thermal insulator is also adiabatic. Adiabatic processes are characterized by an increase in entropy, or degree of disorder, if they are irreversible and by no change in entropy if they are reversible. Adiabatic processes cannot decrease entropy.

### When gas expands, does it do work on its surroundings?

Yes, if the gas expands then it is doing positive work on its surroundings. The sign convention comes in when expressing the first law of thermodynamics. If you choose a convention where by work you mean work done by the system, then you’ll need a minus sign to reflect the change in energy of the system.

### Does gas expand when heated?

When gases are heated, the thermal energy of the molecules and atoms present in it increase. Due to increase in the thermal energies, the amplitude of their oscillations increase. As they start oscillating with larger amplitudes they require more space. This is the reason why gases expand when heated.

When a gas is heated,?

When you heat a gas, both its vapor pressure and the volume it occupies increase . The individual gas particles become more energetic and the temperature of the gas increases. At high temperatures, the gas turns into a plasma.