air         0.0012
gasoline    0.67
ice         0.9
pure water  1.0
seawater    1.025
human body  1.03
limestone   2.6
granite     2.7
iron        7.8
silver      10.5
mercury     13.6
gold        18.9
platinium   21.4
Earth mean  5.52
Earth core  13
Moon        3.3
Sun mean    1.4
Sun core    160
proton      2.8E+14