At One Place

Does mercury float?

Does mercury float?
No
13,534 kg/m³ against water's 1,000

Mercury sinks. At 13,534 kg/m³ it is 13.53 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
13,534 kg/m³
Relative to fresh water
13.534×
Floats in fresh water
No
Floats in seawater
No

Compared with other materials

Material Density Floats
Inconel 718 8,190 kg/m³ No
brass 8,500 kg/m³ No
tin-lead solder (60/40) 8,520 kg/m³ No
bronze 8,800 kg/m³ No
Monel 400 8,800 kg/m³ No
nickel 8,908 kg/m³ No
copper 8,960 kg/m³ No
silver 10,490 kg/m³ No
lead 11,340 kg/m³ No
mercury ← 13,534 kg/m³ No

Common questions

Does mercury float in water?
No — at 13,534 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