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Snow

Snow comprises individual ice crystals that grow while suspended in the atmosphere—usually within clouds—and then fall, accumulating on the ground where they undergo further changes. Wikipedia
Compressive strength (σc): 3–7 MPa
Density (ρ): 0.1–0.8 g/cm3
Melting temperature (Tm): 0 °C
Tensile strength (σt): 1.5–3.5 kPa
Thermal conductivity (k) For densities 0.1 to 0.5 g/cm3: 0.05–0.7 W/(K·m)