<em>Thomas Graham</em><em> found that, at a constant temperature and pressure the rates of effusion of various gases are inversely proportional to the square root of their masses.</em>
∨ ∝ 1/√M,
where, ∨ is the rate of effusion and M is the atomic or molecular weight of the gas particles.
For two different gases, unknown gas (1) and hydrogen (2):
testable questions are answer through observation or an experiment that provides evidence that the questions connects to the scientific concepts rather the opinion feelings
therefore the question can be tested through observation or experiment
