An impeller (also written as impellor or impellar) is a rotor used to increase (or decrease in case of turbines) the pressure and flow of a fluid. An impeller for a dam turbine generator.
The smallest planet in the Solar System is Mercury (the biggest planet is Jupiter). For the longest time, the smallest planet was considered to be Pluto, but now Pluto isnât a planet any more, so weâre back to Mercury.Mercury measures 4879 km along its equator.Just for comparison, Earth is 12,742 km across.So Mercury is only 38% the diameter of Earth.or the longest time, the smallest planet was considered to be Pluto, but now Pluto isnât a planet any more, so weâre back to Mercury. Mercury measures 4879 km along its equator. Just for comparison, Earth is 12,742 km across.
[ video ]. In fact, the asteroid is so complex that Russell and members of his team are calling it the smallest terrestrial planet.. Vesta has an iron core, notes Russell, and its surface features indicate that the asteroid is differentiated like the terrestrial planets Earth, Mercury, Mars, and Venus.Differentiation is what happens when the interior of an active planet gets hot enough to melt, separating its materials into layers.esta has an iron core, notes Russell, and its surface features indicate that the asteroid is differentiated like the terrestrial planets Earth, Mercury, Mars, and Venus.