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.
Color image of Mercury. Image credit: NASA. Mercury is the smallest planet in the Solar System and orbits the Sun every 87.969 Earth days. At this time it does not have a moon, but some scientists speculate that it may have had a moon in the ancient past.It is their contention that the orbit of Mercuryâs moon decayed and it impacted the surface of the planet.olor image of Mercury. Image credit: NASA. Mercury is the smallest planet in the Solar System and orbits the Sun every 87.969 Earth days. At this time it does not have a moon, but some scientists speculate that it may have had a moon in the ancient past.