what is the method of measuring the weight of  the gases ?how can you define the process ?

cubic like one cubic is 1.2  air.
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Chemical and physical methods for determining formula weights (or molar masses) have been important historically as a way of identifying new materials. The modern laboratory has a large variety of instrumentation which makes many of these methods obsolete. However the principles upon which the older methods were based are not insignificant and many form the foundation for the prediction of physical and chemical properties and behaviors of substances. 
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