Question

1. which of the following statements is true about the movement of fluid in a convection cell?

○ cool fluid rises because it is less dense.
○ hot fluid rises because it is denser.
○ cool fluid sinks because it is denser.
○ hot fluid sinks because it is less dense

Explanation:

To determine the true statement about fluid movement in a convection cell, we analyze the relationship between temperature, density, and fluid movement:

• Cool fluid is denser than hot fluid. Denser substances tend to sink in a fluid medium.
• Hot fluid is less dense and rises, while cool fluid, being denser, sinks.
• Let's evaluate each option:
• "Cool fluid rises because it is less dense": Incorrect. Cool fluid is denser, so it should sink, not rise.
• "Hot fluid rises because it is denser": Incorrect. Hot fluid is less dense, so it rises, but the reason (being denser) is wrong.
• "Cool fluid sinks because it is denser": Correct. Cool fluid has higher density, so it sinks in the convection cell.
• "Hot fluid sinks because it is less dense": Incorrect. Less - dense hot fluid should rise, not sink.

Answer:

C. Cool fluid sinks because it is denser