Does ice float?
Does ice float?
Yes
917 kg/m³ against water's 1,000
Ice floats. At 917 kg/m³ it is 1.09 times less dense than water, so about 92% of it sits below the surface and the rest above.
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
- 917 kg/m³
- Relative to fresh water
- 0.917×
- Floats in fresh water
- Yes
- Floats in seawater
- Yes
- Proportion submerged
- 92%
Compared with other materials
| Material | Density | Floats |
|---|---|---|
| western red cedar | 370 kg/m³ | Yes |
| spruce | 430 kg/m³ | Yes |
| pine | 500 kg/m³ | Yes |
| Douglas fir | 530 kg/m³ | Yes |
| mahogany | 590 kg/m³ | Yes |
| plywood | 600 kg/m³ | Yes |
| black walnut | 610 kg/m³ | Yes |
| OSB | 640 kg/m³ | Yes |
| particleboard | 650 kg/m³ | Yes |
| teak | 655 kg/m³ | Yes |
Common questions
- Does ice float in water?
- Yes — at 917 kg/m³ it is less dense than water.
- 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
- Ice properties Density, melting point, strength
- Does air float? Yes
- Does expanded polystyrene foam float? Yes
- Does rigid polyurethane foam float? Yes
- Does EVA foam float? Yes
- Does balsa float? Yes
- Does corrugated cardboard float? Yes
- Does cork float? Yes
- Does western red cedar float? Yes
Sources
- United States Geological Survey — USGS (Public domain (US Government))