A planetary probe explores the liquid hydrocarbon seas of Saturn's moon Titan, investigating how hydrostatic pressure varies with depth. Under a surface atmospheric pressure of 147 kPa, the probe first measures pressure at different depths in a reservoir of liquid methane (density 422 kg/m3).
The probe then repeats the investigation in a reservoir of liquid ethane (density 544 kg/m3), which is more dense than liquid methane.
Figure 1 shows the original graph of pressure plotted against depth for the liquid methane.
Compare the line that would be plotted for the liquid ethane with the line for liquid methane in Figure 1.