How long can a helium balloon last?

A bottle of helium is 40L at 10MPa

A balloon is about 10L with a pressure of 0.1mpa per atmosphere

40 * 10 / (10 * 0.1 = 400

Volume of a 2.5-meter diameter balloon = 3.14 * (2.5/2) ^ 2 = 4.90625 square meters = 4906.25 liters

In the standard case,1mol of gas is 22.4 liters, so 4906.25/22.4 = 219mol, so about 219mol of helium is needed, so 219mol*4g/mol=876g of helium is needed.

Helium gas cylinders

Here Newradar uses a 10-inch helium balloon. (A "one-inch" is a one-inch balloon. A one-inch balloon is 2.54 centimeters in diameter. As an example. Normally, a 10-inch helium balloon lasts about five hours. Of course, the duration is variable. If a helium balloon stays in a cooler environment, for example, in an air-conditioned room, it can last longer than seven hours, depending on temperature.

Special attention should be paid to outdoor use: please try to avoid sunlight before the activity begins. The balloon loses its sheen, or "oxidation," due to temperature, and the helium balloon's lifetime is greatly reduced. If you can't get out of direct sunlight with a helium balloon, it's important to note that a helium balloon can only last about four hours in the sun, which is difficult to do in the summer when the light is strong. So be sure to budget a good time for your activities. So take note, guys. How long a helium balloon lasts depends on temperature.

Here Newradar uses a 10-inch helium balloon. (A "one-inch" is a one-inch balloon. A one-inch balloon is 2.54 centimeters in diameter. As an example. Normally, a 10-inch helium balloon lasts about five hours. Of course, the duration is variable. If a helium balloon stays in a cooler environment, for example, in an air-conditioned room, it can last longer than seven hours, depending on temperature.

Special attention should be paid to outdoor use: please try to avoid sunlight before the activity begins. The balloon loses its sheen, or "oxidation," due to temperature, and the helium balloon's lifetime is greatly reduced. If you can't get out of direct sunlight with a helium balloon, it's important to note that a helium balloon can only last about four hours in the sun, which is difficult to do in the summer when the light is strong. So be sure to budget a good time for your activities. So take note, guys. How long a helium balloon lasts depends on temperature.