It expands and spreads out, no matter is created.
it will move randomly and quickly to fill the empty space in the container..that's how the matter in a gas do to fill the container.. P/s: gas is matter that has mass and occupied space.
Spread out.
gas
Gas
It will expand to fill the container and change shape to conform to the interior of the container.
it will spread
A gas. Gas will expand to fill the available space.
A gas takes on the shape of the container it is in and expands to fill the whole container.
Only if this matter is a gas.
Gas. (Or plasma, if one wants to get technical)
A gas. Gas will expand to fill the available space.
if matter expands to fill the volume of its container its a suspension.