How does potassium’s density compare with the density of water?

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A periodic table element box for potassium shows atomic number 19, symbol K, atomic weight 39.0983, electron configuration [Ar]4s1, and name potassium. Icons indicate it is an alkali metal, solid at room temperature, body-centered cubic crystal structure, and has strongly basic higher-valence oxides. A key explains the symbols for alkali metals, solid state, body-centered cubic structure, and strong basicity. — potassium Properties of potassium.

Potassium is less dense than water. The chemical element has a specific gravity of 0.862 at 20 °C (68 °F). Since the specific gravity of water is defined as 1.0 at this temperature, potassium's lower value indicates that it is less dense than water.1