The units of density depend on the units used for mass and volume. The most commonly used units are grams per cubic centimetre (g/cm³) or kilograms per cubic metre (kg/m³). These balloons are ...

Here is a new material capable of behaving like a liquid under low pressure, then solidifying instantly upon impact.

The alloy then enters a range of temperatures where solid and liquid are in equilibrium but there compositions change, the liquid moving down the liquidus line and the solid down the solidus line. As ...