No. In our solar system, Saturn has the lowest density.
Jupiter
Jupiter has the largest atmosphere Saturn has the lowest density
I would think that of these Jupiter would have the lowest density, since Mercury, Venus and Mars are all solid, rocky planets like Earth while Jupiter is a gas giant composed mainly of Hydrogen.
Mercury has the lowest density among the planets listed. Its density is about 5.43 grams per cubic centimeter, making it one of the densest terrestrial planets in our solar system.
Mercury, Venus, Earth, and Mars are all rocky planets, but Jupiter is a gas ball. Just knowing that, we'd have to guess that Jupiter's density is the lowest of the four. Now let's look up the densities: Mercury: 5,427 kg/m3 Venus: 5,243 Earth: 5,515 Mars: 3,933 Jupiter: 1,326 Yup; we guessed right.
Jupiter's average density is 1.33 g/cm^3
Jupiter's density is about 1.3 g/cm3 . Earth's is about 5.5 g/cm3 .
At the standard temperature and pressure, hydrogen gas has the lowest density.
Mercury has the second lowest density of any planet in the solar system. Saturn has the lowest density of any other planet.
The lowest temperature on Jupiter is 234.43 degrees
Hydrogen has the lowest density of all elements. Density of it is 0.084 gm-3. It is a diatomic gas.
Jupiter.