Dust falls on Chicago at a rate of 65 mg m-2 day-1. Major metallic elements in the dust include aluminum, copper, lead, magnesium, manganese and zinc. Lead accumulates at a rate of 0.029 mg m-2 day-1. How many metric tons (1 metric ton = 1000 kg, an exact equality) of lead fall on the 535 km2 of Chicago in one year?

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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.