Gases expand spontaneously to fill their container. Gases are also highly compressible and form homogeneous mixtures. To measure the pressure of a gas a barometer is used. A simple barometer consists of a long glass tube, closed at one end and filled with mercury. There are a variety of ways to measure pressure and each have a different unit.
http://www.chem4kids.com/files/matter_gas.html
http://www.mikeblaber.org/oldwine/chm1045/notes/Gases/Intro/Gases01.htm
http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch4/properties2.html
https://www.chem.purdue.edu/gchelp/liquids/character.html
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