When the American flag is being displayed with flags of states, cities, schools or pennants of societies on the same halyard, the American flag should always be at the peak with the non-national flags below it. When flying flags on adjacent staffs, the American flag should always be hoisted first and lowered last.
Definition of gas. a material that is shipped in compressed gas cylinders or acts as a gas upon release at normal temperatures and pressure, or is used or handled as a gas, whether or not in strict accordance with the definition of a compressed gas as set forth in Article 9 of the Uniform Fire Code. [SEMI S4-92].
The term state can be defined as a set of conditions that describe a person or thing at a given time. It is in this sense of the word that scientists divide matter into the three states shown in the figure below. There are two reasons for studying gases before liquids or solids. First, the behavior of gases is easier to describe because most of the properties of gases do not depend on the identity of the gas. We can therefore develop a model for a gas without worrying about whether the gas is O2, N2, H2, or a mixture of these gases.