Through Thick and Thin

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A Magic Trackpad has an apparent density of 0.29g/cm³, meaning it could be made of solid cork with a density of 0.25g/cm³ (a difference of 0.04g/cm³).
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Material Density (g/cm³)sort descending
Air (room temperature) 0.00
Expanded Polystyrene 0.10
Balsa 0.17
Cork 0.25
Pine 0.50
Oak 0.70
MDF 0.70
Soap 0.80
Butter 0.91
Polystyrene 0.92
Ice 0.92
Water 1.00
ABS 1.05
Nylon 1.10
Rubber 1.10
Paper 1.20
PVC 1.47
Carbon Fibre Composite 1.75
Brick 2.00
Concrete 2.40
Glass 2.50
Quartz 2.65
Aluminium 2.70
Granite 2.70
Slate 2.70
Titanium 4.50
Zinc 6.90
Mild Steel 7.80