The surface gravity of titan, the largest moon of Saturn, is 0.135 that of earth. The atmospheric pressure on Titan's surface is 1.6bar; mainly composed of Nitrogen (N2). The ground surface is believed to be mostly water ice (the surface temperature is 95kelvin). The Huygens probe, part of the Cassini mission to the Saturn system, landed on Titan in early 2005. The probe was approximately a cylinder 1.5 m in diameter and 0.5m tall, with amass of 320 kg.
It was suspected that there are bodies of liquid ethane and methane on Titan's surface; this liquid is probable to have a density of 500kg m(^-3). The ability to survive landing in such a body of liquid had to be designed into the probe. (We know it did not land in liquid, because there was no "splash" recorded with the on board accelerometer, however the pebbles in the image of the landing site are rounded, suggesting they have wrought by erosion by running liquid, as in a stream or on a beach.)
1. Assuming the vertical extent of Titan's atmosphere is the same as Earth's, how does the density of titan's atmosphere compare to that of earth?
2. What is the total pressure at the bottom of Titan an methane/ethane "lake" 15 m deep?
3. Would the Huygens probe have floated if it had landed in such a “lake"?