7. To determine the flowing velocity of a stream, a student dropped a ball into the water. He measured that in 5 minutes the ball moved 15 m downstream. What was the stream velocity? If the cross-sectional area of the flow channel was 10,000 cm², how much water (in m³) flowed through the stream in 1 hour?

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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.