In the gaseous, $$\left( g \right)$$, state of matter, the individual particles of a substance are able to fully separate from one another and move randomly in three-dimensional space.  As a result, gases, such as molecular chlorine, Cl2, have neither a defined volume nor a defined shape and will disperse until their constituent particles are uniformly distributed throughout the container in which they are placed, as shown below in Figure $$\PageIndex{1}$$.