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Name any two substances whose density cannot be measured accurately.

Density of Common Substances

Material Density (kg/m3)
Air (1 atm, 20 degrees C 1.20
Aluminum 2,700
Benzene 900
Blood 1,600
Brass 8,600
Concrete 2,000
Copper 8,900
Ethanol 810
Glycerin 1,260
Gold 19,300
Ice 920
Iron 7,800
Lead 11,300
Mercury 13,600
Neutron star 1018
Platinum 21,400
Seawater (Saltwater) 1,030
Silver 10,500
Steel 7,800
Water (Freshwater) 1,000
White dwarf star 1010




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