The process in which the temperature of a system is always
kept constant is called isothermal process.
We can keep the temperature of a system constant only when we
allow the extra heat energy to go out and vice versa. This is possible only
when the system is perfectly conducting to the surroundings. It also has to be
performed in a slow manner. We shall give enough time for the system is to
absorb the heat energy at constant temperature are to send the heat energy out
at constant temperature.
Being the temperature is constant Boyle’s law very much valid
in this process. We can derive the equation for the work done in isothermal
process as shown below. As the pressure is variable work done is identified
with the integration process.
Problem and solution
The pressure of a certain mass of a gas is increased by 10%
in isothermal process. What is the percentage change in its volume?
We shall be little bit carefully while we are dealing with
this kind of percentage problems. When the value of the percentages big, we can
apply directly and when the percentages a small we shall go for the merit of
approximations.
Problem and solution
One more law ideal gas expands isothermal li to double to its
volume at a temperature of 27°C .What is the work done in this process?
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