For example, to find the K value of methane at 100 psia and 60 °F.
# On the left-hand vertical axis, locate and mark the point containing the pressure 100 psia.
# On the right-hand vertical axis, locate and mark the point containing the temperature 60°F.
# Connect the points with a straight line.
# Note where the line crosses the methane axis. Read this K-value off the chart (approximately 21.3).