Question

1. hot air rises due to its difference in ______. (1 point)

○ mass
○ density
○ weight
○ composition

Explanation:

Hot air rises because when air is heated, its volume expands while mass remains relatively constant. Density is defined as mass per unit volume ($
ho=\frac{m}{V}$). So, hot air has lower density than cooler air around it. Objects (or air masses) with lower density than the surrounding fluid (air, in this case) will rise due to buoyancy. Mass is the amount of matter, weight is mass times gravity, and composition doesn't directly cause rising due to heating - the key factor is density change.

Answer:

B. density (assuming the options are labeled as A. mass, B. density, C. weight, D. composition)