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A speculative example how nitrogen could be discovered
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Looking, sonar sounding, radiating, magnetizing, light shining and changing temperature are considered variations in measuring methods. Below -80 degree Celsius the feature aggregate state for nitrogen is liquid, which differs from the remaining still gaseous objects. Therefore, we can conclude that the liquid must be a separate object from the gaseous. Thus, we have found a feature by which it differs from the rest. Hence, we took away the imperative hidden nature by changing environmental conditions, i.e. temperature, until nitrogen looked different from the rest. There was no data, which could have told us in advance that gradually lowering the temperature would expose features of difference between the objects. That is why we must become creative in finding ways by which we can vary environmental conditions and measurement methods until hidden objects differ from one another or their environment in at least one feature, which we can measure. But as long as cooling down to – 80 degree Celsius, nitrogen remains an imperative hidden object unless researchers can find other means to make one of nitrogen’s feature from its background and other visible object. If cooling does not work, nitrogen could be isolated from the other gases by boiling it.
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