Question

On a p-v plane for a pure substance in superheated region, the slopes of constant temperature lines are

Answer 1

Thank you for getting in touch with us for the answer of your query. On a p-v plane for a pure substance in super heated region the slopes of the constant temperature lines are negative, because temperature is constant. However, they could be zero or infinite too, for the other processes but they cannot be positive because for being positive the volume and pressure needs to be raised simultaneously which is not possible.