Two balloons of the same volume are filled with two gases at the same pressure, one with hydrogen and the other with helium. Which of the two experiences a greater upward force?

Two balloons of the same volume are filled with two gases at the same

1.	Two balloons of the same volume are filled with two gases at the same pressure, one with hydrogen and the other with helium. Which of the two experiences a greater upward force?
Answer» SOLUTION :The upward FORCE for the hydrogen-filled balloon will be GREATER. Here, resultant upward force = upthrust - weight of GAS - filled balloon. SINCE, the volumes of both balloons are the same, the total weight of the air displaced by them is also the same. So the upthrust exerted by air on both of them is equal. But, under the same condition of temperature and pressure, the density of helium is more than that of hyrdogen. So, due to the lower weight of the hydrogen-filled balloon, the upward force on it will be greater.