A substance or medium that conducts heat, light, sound, or especially an electric charge.
The transfer of energy from one body to another as a result of a difference in temperature or a change in phase.
The upward force that a fluid exerts on an object less dense than itself.
The egg in normal water sinks while a egg in water with little sodium still sinks when a egg in water with a lot of sodium floats.
The push or pull of a metal from one place to another.