What is the main source of helium?
What are main source of helium gas?
Why is helium gas used to fill balloons instead of hydrogen gas? What makes helium flammable? Is Helium considered an inert gas? If not, why? What is hydrogen gas? Is helium an element, mixture or a compound? Which of the two gasses is more polar, CH4 or Helium? What can you do to make helium non flammable? Energy required to ionize helium? What are the consequences of getting high on helium? What does a natural gas contain? Why is helium a p-block element? What are the gas elements at room temperature? What is a oxidation number, and what is this number for helium? What gases are dissolved in liquids? What are some examples? Why do helium balloons deflate? Where will I get hydrogen gas? What would be the benefits if we discovered an element lighter than helium but it exists as a solid in room temperature? Any possible uses? How do helium-3 and helium-4 differ? In nuclear reactor reactions, "4H -> He+ 2positrons and some gases... Then, what happens to helium in above reaction? Why is helium placed in the p-block? Is helium combustible? If so, why? What is the product of burning hydrogen gas? Which gas is readily soluble in water at room temperature? What are some examples of gas to liquid? Why is water gas (mixture of hydrogen gas and carbon monoxide)  called as water gas? What is natural gas? What is the molar mass of helium? Is air considered a fluid or a gas? Why? How is gas dissolved in water? Is nitrogen an ideal gas? Why or why not?