Density of Potassium
Density of Potassium is an important parameter among its mechanical properties. Potassium density is nothis but exact value of its mass(weight) per unit volume. Depending on the density, metals are classified as Heavy Metals. Its density at room temperature (near room temperature) is 0.86 g/cm^{3}. And if you talk about its density at liquid state, it is 0.83 g/cm3.
Viscosity of Potassium cannot be determined, as the concept of viscosity is only applicable to fluid (liquid state) substances.
Tensile Strength of Potassium
Tensile strength of Potassium is Not Available. Its tensile strength reflects the effect of applied force to wrench the metal while it reaches the point where it breaks down into pieces. Its tensile strength is a deciding factor while comparing mechanical properties of Potassium with other metals. The extent of application of any metal is determined by its tensile strength.