Complete the operation and express the answer with the appropriate number of significant figures and units.     A pipet delivers 10.9 mLmL , 10.1 mLmL , and  10.9 mLmL  in consecutive trials. Find the mean volume of the samples.       A 140 mgmg  sample was placed on a watch glass that has a mass of 7.482 gg . What is the mass of the watch glass and sample in grams?

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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.