Pretty much nothing.
It'll mix with the atmosphere and diffuse.
Not a problem unless you have huge amounts in a closed, small space.
what happens is that the heat gets trapped in the container and it turns foggy
Helium is a gas and will take the shape of the container it is taken
It gets the liquid get the shape like water.
Every liquid, with the single exception of liquid helium, will eventually freeze if it gets cold enough. Helium, however, does not freeze.
depends on the size of its container and volume of helium filling it
Of course. What a strange question! It implies that helium may be able to keep in a shape that is not the same as its container and thefore leave a vacuum in parts of the container.
Pressure in the container gets higher because of the steam deriving from water, and if you do not let the steam out it will probably explode in a short time.
put it in a metil container
If the lid is removed from a container holding helium gas, the helium will escape into the surrounding environment since helium is lighter than air. This can result in the helium dispersing quickly due to its low density compared to the air around it.
No, helium has weight, but it rises when its in an expandable container such as a balloon because it is lighter than the nitrogen rich atmosphere but inside of a rigid container the helium can only add weight. (see the mythbuster's episode about the helium football)
Helium at room temperature is a gas. You can certainly put your hand in a container of helium and touch it although you would not feel anything.
When you transfer the helium gas from a 500 mL container to a 1000 mL container, its pressure will decrease while the temperature remains constant, according to Boyle's Law. The density of the helium will also decrease because density is defined as mass divided by volume. However, the amount of helium (in grams) and its temperature will not change during this process.