Praxis 5511 Practice Test Practice Question
A hot-air balloon rises in the atmosphere because the hot air in the balloon
Correct Answer: B
Rationale: A hot-air balloon rises due to the principle of buoyancy, which is related to density. Option B accurately explains that the hot air inside the balloon is less dense than the cooler air outside, allowing it to rise.
Option A is incorrect; while pressure differences exist, it is the density that primarily drives the balloon's ascent, not the pressure itself.
Option C is misleading; inertia refers to an object's resistance to changes in motion and does not influence buoyancy.
Option D is irrelevant; the composition of gases does not affect the buoyancy of the balloon as long as the air is heated.
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