in an isobaric process it is said that pressure is constant and volume changes....does it mean that pressure will remain constant WHILE volume changes OR volume changes till pressure of system and external pressure become equal(if this is the case where is the pressure constant according to the Definition...wouldnt the initial pressure and final pressure be different )--Q1
for eg.a movable piston in a cylinder moves(i.e. gas expands) till the pressures below it and above it are equal....this has been described as an isobaric process...i don't think so because i think that the piston will move and stop only when the net force on it is zero...it is the forces which bring it to equilibrium not the pressures being equal......
what i mean to say is what makes the piston move is it the pressure difference or the forces--Q2
please answer my both questions in detail??
for eg.a movable piston in a cylinder moves(i.e. gas expands) till the pressures below it and above it are equal....this has been described as an isobaric process...i don't think so because i think that the piston will move and stop only when the net force on it is zero...it is the forces which bring it to equilibrium not the pressures being equal......
what i mean to say is what makes the piston move is it the pressure difference or the forces--Q2
please answer my both questions in detail??
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You seem a bit confused by the way someone explained it to you.
Isobaric process simply means that the pressure during the process will remain constant. It has nothing to do with pressures outside the system, which in this case is only the gas inside the cylinder.
Is as in the case you mentioned, moves out , the gas will expand and volume will increase, so it will constantly need energy to increase the temperature to keep the pressure constant.
On the other hand, if piston moves in, the volume will decrease and pressure will tend to increase, but in an isobaric process, the system will be in contact with a heat sink so that the temperature is lower than before and pressure remains same as before.
The need for increase or decrease of temperature can be found from the Gas Equation, PV=nRT.
As n and R are constant, absolute temperature must be increased or decreased to keep the ratio T/V constant.
Isobaric process simply means that the pressure during the process will remain constant. It has nothing to do with pressures outside the system, which in this case is only the gas inside the cylinder.
Is as in the case you mentioned, moves out , the gas will expand and volume will increase, so it will constantly need energy to increase the temperature to keep the pressure constant.
On the other hand, if piston moves in, the volume will decrease and pressure will tend to increase, but in an isobaric process, the system will be in contact with a heat sink so that the temperature is lower than before and pressure remains same as before.
The need for increase or decrease of temperature can be found from the Gas Equation, PV=nRT.
As n and R are constant, absolute temperature must be increased or decreased to keep the ratio T/V constant.
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in an isobaric process the pressure exerted by the system is constant throughout. There would be no change in pressure exerted whatsoever. Initial and final pressure exerted by the system would be same...A1
consider for example, there is temperature increase. the volume would have to be increased proportionately to maintain the constant pressure.
probable misconception: you think that volume can change only due to pressure change.
consider for example, there is temperature increase. the volume would have to be increased proportionately to maintain the constant pressure.
probable misconception: you think that volume can change only due to pressure change.