Two balloons are filled with the same quantity of helium gas, and the balloons a
ID: 2212786 • Letter: T
Question
Two balloons are filled with the same quantity of helium gas, and the balloons are placed inside a large vacuum chamber. The balloons expand or contract in such a way that the pressure inside the two balloons is the same. If balloon A is at twice the temperature of balloon B (in absolute temperature scale), which of the following is true about the gas density (not volume) inside balloon A? One fourth as dense as the gas inside balloon B. Half as dense as the gas inside balloon B. Four times as dense as the gas inside balloon B. Twice as dense as the gas inside balloon B.Explanation / Answer
B. Half as dense as the gas inside balloon
because
Because of the Archimedes' principle, a lifting gas is required for aerostats to create buoyancy. Its density is lower than that of air (about 1.29 kg/m3, 1.29 g/L). Only certain lighter than air gases are suitable as lifting gases.