In AB and BC of the graph, the substance is first under the constant temperature condition then under section BC the linear increment in the temperature with the time.
What is a graph ?
A graph is a pattern consisting of a collection of elements, some of which are connected in some way.
In the isothermal process, the change in the temperature is zero. While if temperature is increasing along the time, a linear relationship is found.
Hence, in AB and BC section of the graph, the substance is first under the constant temperature condition then under section BC the linear increment in the temperature with the time.
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