Densities of various materials covering a range of values Material ρ ( kg / m ) Notes Hydrogen 0.0898 Helium 0.179 Aerographite 0.2 Metallic microlattice 0.9 Aerogel 1.0 Air At sea level Tungsten hexafluoride 12.4 One of the heaviest known gases at standard conditions Liquid hydrogen 70 At approx. − 255 ° C Styrofoam 75 Approx . Cork 240 Approx . Pine 373 Lithium 535 Wood 700 Seasoned , typical Oak 710 Potassium 860 Ice 916.7 At temperature < 0 ° C Cooking oil 910 ... 930 Sodium 970 Water ( fresh ) 1,000 At 4 ° C , the temperature of its maximum density Water ( salt ) 1,030 0.9 % Liquid oxygen 1,141 At approx. − 219 ° C Nylon 1,150 Plastics 1,175 Approx. ; for polypropylene and PETE / PVC Tetrachloroethene 1,622 Magnesium 1,740 Beryllium 1,850 Glycerol 1,261 Concrete 2,400 Silicon 2,330 Aluminium 2,700 Diiodomethane 3,325 Liquid at room temperature Diamond 3,500 Titanium 4,540 Selenium 4,800 Vanadium 6,100 Antimony 6,690 Zinc 7,000 Chromium 7,200 Tin 7,310 Manganese 7,325 Approx . Iron 7,870 Niobium 8,570 Brass 8,600 Cadmium 8,650 Cobalt 8,900 Nickel 8,900 Copper 8,940 Bismuth 9,750 Molybdenum 10,220 Silver 10,500 Lead 11,340 Thorium 11,700 Rhodium 12,410 Mercury 13,546 Tantalum 16,600 Uranium 18,800 Tungsten 19,300 Gold 19,320 Plutonium 19,840 Rhenium 21,020 Platinum 21,450 Iridium 22,420 Osmium 22,570 Notes : Jump up ^ Unless otherwise noted , all densities given are at standard conditions for temperature and pressure , that is , 273.15 K ( 0.00 ° C ) and 100 kPa ( 0.987 atm ) . ^ Jump up to : Air contained in material excluded when calculating density

Question: which material is the heaviest in term of density
Answer: Osmium