Question

which of these characteristics does the hot gas in the hot air balloon have? constant shape low density not compressible

Explanation:

Gases do not have a constant shape as they take the shape of their container. Gases are compressible. When gas is heated in a hot - air balloon, its density decreases (using the formula \(
ho=\frac{m}{V} \), as temperature increases, volume \( V \) increases for a fixed mass \( m \), so density \(
ho \) decreases). This low - density gas then rises (Archimedes' principle: an object will float if its density is less than the density of the fluid (in this case, the surrounding air) it is in).

Answer:

low density