Paragraph: A fixed mass ' m ' of a gas is subjected to...

$K$ to $L$ isobaric process, volume increases with increase in temperature i.e., Heating
$L$ to $M$ isochoric process, pressures decreases with decrease in temperature i.e., cooling
$M$ to $N$ isobaric process, volume decreases with decrease in temp i.e., cooling
$N$ to $K$ isochoric process, pressures increases with increase in temperature i.e., heating