Because Helium gas is lighter than air, but it is not the only gas we can fill the balloon, we may use hydrogen gas as well. The density of hydrogen gas is 1/2th of the mass of helium gas so we can consider it to make a floating balloon. Air can also be used to fill the balloon.

A hot-air balloon floats in the atmosphere, whereas a typical balloon filled with air will not float. When air is heated, it expands and becomes lighter than the cooler air it displaces. Therefore, each cubic foot of hot air can lift about 7 grams. That is not much and explains why hot-air balloons are so large.

What makes balloons float when they are full of air but not float when they are deflated? Balloons float when they are full of hot air because the hot air weighs less than the air that is in the chamber which results in a floating balloon. The hot air inside the envelope is less dense than the surrounding (cooler) air.

Gravity is pulling down on all of the air in the atmosphere, which puts pressure on everything in the atmosphere. This pressure is higher on the bottom of the balloon than the top because of the weight of the air lying in between. The pressure difference causes a force to act upwards on the balloon.

Helium balloons are pulled by gravity, as are all objects with mass. The reason they don’t fall is that there is another force acting on them, a buoyant force from air pressure that is equal to the weight of the air displaced by the balloon.

Because density is altered by altitude, the helium balloon can reach a height of 9,000 meters, or 29,537 feet. Anything higher than this altitude will cause the helium within the balloon to expand and the balloon to pop.

Helium balloons float because helium is less dense than air. Helium balloons deflate because helium atoms are small enough to slip between spaces in the balloon material. Helium balloons are Mylar and not rubber because there is less space between the molecules in Mylar, so the balloon stays inflated longer.

Here’s what it does to make your voice sound weird: The rate of this vibration, which controls the frequency and pitch of your voice, doesn’t change when you suck in helium. Inhaling helium makes the higher-pitched tones resonate more in the vocal tract, amplifying them so they are louder in the mix.

Breathing in pure helium can cause death by asphyxiation in just minutes. Inhaling helium from a pressurized tank can also cause a gas or air embolism, which is a bubble that becomes trapped in a blood vessel, blocking it. The blood vessels can rupture and hemorrhage.

No. For one thing, helium doesn’t affect the way your vocal cords work. The reason for the high pitch of the voice is the density or viscosity of the gas passing between the vocal cords—not a change in the vocal cords themselves.

You can breathe in helium to change the sound of your voice and illustrate how density affects the speed of sound. You can pick up a helium-filled balloon at many grocery or party supply stores. To make your voice squeaky, you just exhale air, take a deep breath of helium and talk (or sing, if you’re extroverted.)

Most kids would agree: Sucking a lungful of helium out of a balloon makes your voice sound hilarious. But contrary to popular belief, the switch from air to helium gas doesn’t actually increase the pitch of your voice (at least not very much).

In fiscal year (FY) 2019, the price for crude helium to Government users was $3.10 per cubic meter ($86.00 per thousand cubic feet) and to nongovernment users was $4.29 per cubic meter ($119.00 per thousand cubic feet).

Helium Shortage 3.0 will likely ease in the second half of 2020, but that does not mean it’s going away anytime soon – in fact it will remain until 2021. In the long-term, a different looking market may exist by 2025, driven by a raft of new projects coming on-stream.

Dollar Tree does fill helium balloons for free when purchased either in-store or online as of 2021. Additionally, Dollar Tree can only fill foil balloons and also sells a select range of pre-filled balloons in-store. Dollar Tree will also blow up balloons with helium for $1 that have been purchased elsewhere.

Latex balloons filled with helium typically cost between 50 cents and $1 at party stores. Filled Mylar or foil balloons typically cost $1 to $4 for normal-size balloons, 18-inches in diameter and smaller, or $7 to $15 for oversized or jumbo balloons, which may be 20- to 50-inches in their longest measurement.