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Does magnesium float?

Does magnesium float?
No
1,738 kg/m³ against water's 1,000

Magnesium sinks. At 1,738 kg/m³ it is 1.74 times denser than water.

Why

Floating is decided by density alone — mass divided by volume — compared against the fluid. Weight has nothing to do with it directly: a 200-tonne ship floats and a 2-gram pebble sinks, because the ship encloses enough air to bring its average density below that of water. That is also the only reason a steel hull works.

The numbers

Density
1,738 kg/m³
Relative to fresh water
1.738×
Floats in fresh water
No
Floats in seawater
No

Compared with other materials

Material Density Floats
ABS 1,050 kg/m³ No
polystyrene 1,050 kg/m³ No
plaster 1,100 kg/m³ No
nylon 6 1,140 kg/m³ No
nylon 66 1,140 kg/m³ No
epoxy resin 1,150 kg/m³ No
acrylic (PMMA) 1,180 kg/m³ No
polycarbonate 1,200 kg/m³ No
lignum vitae 1,230 kg/m³ No
PLA 1,240 kg/m³ No

Common questions

Does magnesium float in water?
No — at 1,738 kg/m³ it is denser than water's 1,000.
Does weight decide whether something floats?
No, density does. A 200-tonne ship floats and a small pebble sinks, because the ship encloses enough air to bring its average density below water.

Related pages

Sources

  1. Wikidata — Wikimedia Foundation (CC0 1.0)

How these figures are compiled and checked