Using one or more of your senses to gather information is called

An observation. 

An observation can be a stated or written statement, remark or comment that is based on what was heard, seen, tasted, felt  or smelled. Observations are very important in experimentation. To make an observation is considered as the central element in a scientific process or method. This is a skill that scientist ought to be good at. 

answer: mole of the gas

answer: mole of the gasexplanation:

answer: mole of the gasexplanation: this is because 1 mole of a gas is 22.4dm³, which is use in ideal gas