Question

Many technologies use enclosed fluids. For example, a hydraulic press at an auto repair shop uses trapped water to lift heavy cars. Hot-air balloons heat trapped air to lift a basketful of people. Look at the two diagrams that model fluid particles. •The first cup A has many tightly packed circles. •The second cup B has fewer and more widely spaced circles in motion. Which statement best identifies which of these models represents a gas?

A. Diagram B is a gas, because its particles move more slowly and are farther apart.

B. Diagram A is a gas, because its particles move more slowly and are closer together.

C. Diagram B is a gas, because its particles move more quickly and are farther apart. D. Diagram A is a gas, because its particles move more quickly and are closer together.
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Answer 1

Answer: Answer C is correct.

Explanation: Gas particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster. Making choice C correct.