In a vertical circular pipe with 25mm inner diameter, the mixture of water and gas flow together, the pressure is atmosphere pressure. Calculating flow specific volume of two-phase flow. Some known parameters: gas density is 1.2kg/m3, liquid density is 1000kg/m3. The mass flux of gas (G’’) is 200kg/m2s, the superficial velocity for water is 1.5m/s.

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.