The amount of helium in a tank depends on how big the tank is (volume), the pressure of the helium and its temperature. It is calculated from the ideal gas equation with allowance for compressibility.
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The amount of helium in a helium tank can vary depending on the size of the tank. Common sizes range from small disposable tanks with around 8-14 cubic feet of helium, to larger refillable tanks with capacities of 100 cubic feet or more.
Helium tanks are very useful and are used in many ways. Helium tanks are used to fill diving tanks with some helium so as to dilute the oxygen in the diving tank.
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The volume of a helium tank refers to the physical space it occupies and is not directly related to the number of balloons it can fill. When the helium is released from the tank and fills the balloons, it expands to occupy a much larger volume due to the low density of helium gas compared to its liquid form in the tank. This expansion allows the helium from a tank with a small volume to fill a larger number of balloons.
A steel tank filled with helium gas does not rise in air because the weight of the tank and the helium gas inside is still greater than the buoyant force acting on it. The buoyant force is the force that causes objects to float in a fluid, like air. Since the tank is heavy and the helium gas is not strong enough to lift it, the tank remains on the ground.
No. Firstly, helium will not explode chemically as it is inert. Secondly, if you wanted to increase the pressure in the tank, you'd have to heat it, not cool it. If the tank material were faulty, it might conceivably crack but in that case the helium would just escape.
The particles of helium are farthest apart in a balloon.