# What is isothermal expansion in Carnot cycle?

## What is isothermal expansion in Carnot cycle?

The Carnot cycle consists of the following four processes: A reversible isothermal gas expansion process. In this process, the ideal gas in the system absorbs qin amount heat from a heat source at a high temperature Thigh, expands and does work on surroundings. A reversible adiabatic gas expansion process.

## What is true about an isothermal graph of isotherm on P-V diagram?

For an ideal gas, from the ideal gas law PV = NkT, PV remains constant through an isothermal process. A curve in a P-V diagram generated by the equation PV = const is called an isotherm. For an isothermal, reversible process, the work done by the gas is equal to the area under the relevant pressure -volume isotherm.

What is the graph of isothermal process?

Isothermal Curve – Isotherm On a pV diagram, the process occurs along a line called an isothermal curve or an isotherm. This curve has the equation p = constant / V. It can be derived from the ideal gas law. In an ideal gas, molecules have no volume and do not interact.

What is TS diagram of Carnot cycle?

The temperature-entropy diagram (Ts diagram), in which the thermodynamic state is specified by a point on a graph with specific entropy (s) as the horizontal axis and absolute temperature (T) as the vertical axis, is the best diagram to describe the behavior of a Carnot cycle.

### What happens isothermal expansion?

One condition, known as an isothermal expansion, involves keeping the gas at a constant temperature. In this case the gas cools as it expands, because, by the first law, the work done against the restraining force on the piston can only come from the internal energy of the gas.

### What do you mean by isothermal process isobaric process and Isochoric process with P-V diagram?

isobaric process: constant-pressure process in which a gas does work. isochoric process: a constant-volume process. isothermal process: a constant-temperature process. adiabatic process: a process in which no heat transfer takes place.

What is indicator diagram draw for isothermal process give its significance?

W = ∫v1v2 PdV = Area ABCD, in the indicator diagram. Hence, in an indicator diagram the area under the curve represents the work done (Fig.). When a gas undergoes expansion or compression at constant temperature, the process is called isothermal process.

What is the use of a PV and TS diagrams?

P-V and T-s diagrams are often used to visualize the processes in a thermodynamic cycle and help us better understand the thermodynamics of engines.

## How to plot the Carnot cycle using a P-V diagram?

We will use a p-V diagram to plot the various processes in the Carnot Cycle. The cycle begins with a gas, colored yellow on the figure, which is confined in a cylinder, colored blue. The volume of the cylinder is changed by a moving red piston, and the pressure is changed by placing weights on the piston.

## What is the Carnot cycle?

The Carnot Cycle is one of the fundamental thermodynamic cycles and is described on this web page. We will use a p-V diagram to plot the various processes in the Carnot Cycle. The cycle begins with a gas, colored yellow on the figure, which is confined in a cylinder, colored blue.

What is the isothermal expansion of the air?

This isothermal expansion is represented by curve 1-2 on p-v and T-s diagrams in the figure. The heat supplied the hot body is fully absorbed by the air and is utilized in doing external work. Since the temperature is constant, there is no change in internal energy of the air, i.e E=0. According to the first law of thermodynamics.

What happens to the working substance during isothermal expansion?

Let the working substance during isothermal expansion goes from its initial state A (P 1, V 1, T 1) to the state B (P 2, V 2, T 1) at constant temperature T 1 along AB. In this process, the substance absorbs heat Q1 from the source at T 1 and does work W 1 given by