What Goes up When You Blow in It and Down When You Forget About It Answer

What Goes up When You Blow in It and Down When You Forget About It

Have you ever wondered what happens to a balloon when you blow air into it and then forget about it? It’s an intriguing phenomenon that has fascinated many people over the years. In this article, we will explore the science behind what goes up when you blow in a balloon and down when you forget about it. So, let’s dive in!

When you blow air into a balloon, you are essentially creating pressure inside the balloon. As you blow, the air molecules collide with each other, increasing the number of collisions and, thus, the pressure. This increased pressure causes the balloon to expand and inflate. The balloon stretches to accommodate the increased volume of air inside it.

As the balloon expands, it becomes buoyant due to the difference in density between the air inside the balloon and the air outside. This buoyancy is what makes the balloon rise when you let it go. The air inside the balloon is less dense than the surrounding air, so it experiences an upward force called buoyant force. This force overcomes the downward force of gravity, causing the balloon to float upward.

Now, what happens when you forget about the balloon and leave it unattended for some time? The answer lies in the concept of gas diffusion. Over time, the air molecules inside the balloon slowly escape through the tiny pores in the rubber material. This process is known as gas diffusion.

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As the air molecules escape, the pressure inside the balloon decreases. With a decrease in pressure, the buoyant force begins to weaken. Eventually, the buoyant force becomes less than the force of gravity, and the balloon starts to descend. The balloon will continue to sink until the buoyant force and gravity are balanced, causing it to settle back down on the ground.


Q: Why does the balloon deflate?
A: The balloon deflates because the air molecules inside it slowly escape through the porous rubber material, leading to a decrease in pressure.

Q: Can I prevent the balloon from deflating?
A: While it is impossible to completely prevent the balloon from deflating, you can slow down the process by using materials with lower gas diffusion rates, such as Mylar balloons.

Q: How long does it take for a balloon to deflate?
A: The time it takes for a balloon to deflate depends on various factors, including the material of the balloon, the size of the pores, and the initial pressure inside the balloon. Generally, it can take anywhere from a few hours to a few days for a balloon to completely deflate.

Q: Why does the balloon rise when I initially blow air into it?
A: When you blow air into a balloon, the pressure inside increases, causing the balloon to expand. The increased volume of air inside the balloon makes it less dense than the surrounding air, leading to a buoyant force that makes the balloon rise.

Q: Can I keep a balloon inflated indefinitely?
A: No, it is not possible to keep a balloon inflated indefinitely. Eventually, the air molecules will escape through the pores in the balloon’s material, causing it to deflate.

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In conclusion, the phenomenon of what goes up when you blow in a balloon and down when you forget about it is a result of the principles of pressure, buoyancy, and gas diffusion. When you blow air into a balloon, it inflates and rises due to the buoyant force. However, over time, the air molecules escape, causing a decrease in pressure and subsequent deflation. So, the next time you play with a balloon, remember the science behind its behavior!

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