A chemist needs to know the mass of a sample of aniline to 2 significant digits. She puts the sample on a digital scale. This is what the scale shows: 00072 4 g If this measurement is precise enough for the chemist, round it to 2 significant digits. Otherwise, press the "No solution" button.

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.