Advertisements
Advertisements
प्रश्न
What is an isothermal process?
उत्तर
A process in which change in pressure and volume takes place at a constant temperature is called an isothermal process or isothermal change. For such a system, ΔT = 0. An isothermal process is a constant temperature process.
APPEARS IN
संबंधित प्रश्न
An electric heater supplies heat to a system at a rate of 100W. If the system performs work at a rate of 75 Joules per second. At what rate is the internal energy increasing?
Write the mathematical expression of the First Law of Thermodynamics for the Isobaric process.
The internal energy of an ideal gas decreases by the same amount as the work done by the system.
(a) The process must be adiabatic.
b) The process must be isothermal.
(c) The process must be isobaric.
(d) The temperature must decrease.
A thermally insulated, closed copper vessel contains water at 15°C. When the vessel is shaken vigorously for 15 minutes, the temperature rises to 17°C. The mass of the vessel is 100 g and that of the water is 200 g. The specific heat capacities of copper and water are 420 J kg−1 K−1 and 4200 J kg−1 K−1 respectively. Neglect any thermal expansion. (a) How much heat is transferred to the liquid-vessel system? (b) How much work has been done on this system? (c) How much is the increase in internal energy of the system?
The pressure of a gas changes linearly with volume from 10 kPa, 200 cc to 50 kPa, 50 cc. (a) Calculate the work done by the gas. (b) If no heat is supplied or extracted from the gas, what is the change in the internal energy of the gas?
A solar cooker and a pressure cooker both are used to cook food. Treating them as thermodynamic systems, discuss the similarities and differences between them.
Answer the following in one or two sentences.
State the first law of thermodynamics.
Define an isolated system.
10 kg of four different gases (Cl2, CH4, O2, N2) expand isothermally and reversibly from 20 atm to 10 atm. The order of amount of work will be ____________.
A sample of gas absorbs 4000 kJ of heat and surrounding does 2000 J of work on sample, what is the value of ΔU?
Change in internal energy, when 4 KJ of work is done on the system and 1 KJ heat is given out by the system, is:
If an average person jogs, hse produces 14.5 × 103 cal/min. This is removed by the evaporation of sweat. The amount of sweat evaporated per minute (assuming 1 kg requires 580 × 103 cal for evaparation) is ______.
An ideal gas undergoes cyclic process ABCDA as shown in given P-V diagram (figure). The amount of work done by the gas is ______.
A cycle followed by an engine (made of one mole of an ideal gas in a cylinder with a piston) is shown in figure. Find heat exchanged by the engine, with the surroundings for each section of the cycle. (Cv = (3/2)R)
- AB : constant volume
- BC : constant pressure
- CD : adiabatic
- DA : constant pressure
Write the mathematical equation for the first law of thermodynamics for:
Isothermal process
Write the mathematical equation for the first law of thermodynamics for:
Adiabatic process
The amount of heat needed to raise the temperature of 4 moles of a rigid diatomic gas from 0°C to 50°C when no work is done is ______.
(R is the universal gas constant.)
In the reported figure, heat energy absorbed by a system in going through a cyclic process is ______ πJ.
A system is taken through a cyclic process represented by a circle as shown. The heat absorbed by the system is ______.
A soap bubble in vacuum has a radius of 3 cm and another soap bubble in vacuum has a radius of 4 cm. If the two bubbles coalesce under isothermal condition, then the radius of the new bubble is ______.
ΔU = 0 is true for ______.
The V cc volume of gas having `γ = 5/2` is suddenly compressed to `(V/4)` cc. The initial pressure of the gas is p. The final pressure of the gas will be ______.
Derive an expression for the work done during an isothermal process.
One mole of an ideal gas is initially kept in a cylinder with a movable frictionless and massless piston at pressure of 1.01MPa, and temperature 27°C. It is then expanded till its volume is doubled. How much work is done if the expansion is isobaric?
In an adiabatic process, W = ______.
Explain the formulation of first law of thrmodynamics.
Obtain an expression for the workdone by a gas in an isothermal process.
Define the isothermal process.
