Table of Contents
- 1 When a gas expands what happens to internal energy?
- 2 What happens when gas expands at constant pressure?
- 3 When an ideal gas expands at a constant temperature?
- 4 When an ideal gas expands its temperature?
- 5 When a gas expands at constant temperature Why does the pressure decreases?
- 6 When a gas is compressed at constant temperature What is it called?
- 7 How does temperature affect the internal energy of an ideal gas?
- 8 What is the relationship between internal energy and heat given off?
- 9 What is the work done during free expansion of ideal gas?
When a gas expands what happens to internal energy?
The internal energy of the system decreases as the gas expands. The work can be calculated in two ways because the Internal energy (U) does not depend on path. The graph shows that less work is done in an adiabatic reversible process than an Isothermal reversible process.
What happens when gas expands at constant pressure?
If a gas is to expand at a constant pressure, heat should be transferred into the system at a certain rate. This process is called an isobaric expansion. Fig 1: An isobaric expansion of a gas requires heat transfer during the expansion to keep the pressure constant. Since pressure is constant, the work done is PΔV.
When an ideal gas expands at a constant temperature?
It is correct because at constant temperature kinetic energy of the gas remains the same. Therefore, if gas expands at a constant temperature the kinetic energy of the molecules remains the same.
What is the change in internal energy of an ideal gas which is compressed expanded Isothermally?
Answer : The change in internal energy of gas is zero.
How does the internal energy of an ideal gas vary with volume at constant temperature explain?
Pressure and volume change while the temperature remains constant. Since no work or heat are exchanged with the surrounding, the internal energy will not change during this process. Thus, the internal energy of an ideal gas is only a function of its temperature.
When an ideal gas expands its temperature?
If the gas is ideal, the internal energy depends only on the temperature. Therefore, when an ideal gas expands freely, its temperature does not change. When sand is removed from the piston one grain at a time, the gas expands adiabatically and quasi-statically in the insulated vessel.
When a gas expands at constant temperature Why does the pressure decreases?
When the gas expands at constant temperature, the average kinetic energy of the gas molecules remains the same. However, due to increase in volume of the gas, separation between the molecules increases. As a result the number of molecules colliding per second aganist the walls decreases.
When a gas is compressed at constant temperature What is it called?
Hence, when the gas is compressed, its molecules come closer and internal energy of gas is increased and the number of collisions will also increase. As the gas is compressed, the work done on it shows up as increased internal energy, which must be transferred to the surroundings to keep the temperature constant.
How does internal energy of an ideal gas vary with volume at constant temperature?
There is no change in internal energy for an ideal gas at constant temperature. Internal energy of an ideal gas is a function of temperature only. There is no change in internal energy for an ideal gas at constant temperature.
Why does an ideal gas expand at constant pressure?
When an ideal gas expands at constant temperature, we need to add heat in order for the internal energy to stay the same. This is an isothermal process, as seen below. When an ideal gas expands at constant pressure, known as an isobaric process, we need to add heat in order to keep the pressure constant while we are expanding, as seen below.
How does temperature affect the internal energy of an ideal gas?
That increases its internal energy. The temperature is a measure of the internal energy (kinetic energy of the molecules for an ideal gas). It is impossible to compress any gas without a subsequent rise in temperature and pressure. So your question is moot?
What is the relationship between internal energy and heat given off?
The heat given off or absorbed when a reaction is run at constant volume is equal to the change in the internal energy of the system.
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: