Final answer:
A flask full of heated gas with a bottom opening can allow gas to escape due to kinetic energy of molecules. With another opening at the top, gas may leave through both due to convection currents and spontaneous dispersion of gases.
Step-by-step explanation:
If you have a flask full of heated gas with an opening at the bottom and a connected pipe facing downwards, the heated gas can escape through the hole because of the high kinetic energy of the gas molecules. However, if there's an opening at the top as well, the gas can escape through both openings due to convection currents where hot gas rises and cooler gas moves down to replace it.
Considering that gas molecules are in constant motion, the hotter gas molecules will tend to move upward and may escape through the top opening more readily, while some can still exit through the bottom if the conditions allow, such as lower pressure outside the flask encouraging the flow, or if escaping through the top is not sufficiently rapid to reduce the internal pressure.
As for gaseous behavior, spontaneous dispersion occurs when gas molecules spread out to fill the available space, which aligns with the principle that gases will move from higher to lower concentration or pressure. The vapor pressure generated by the heated molecules effectively pushes the gas out of the flask, and if not allowed to escape, could lead to a dangerous build-up of pressure.