Hydrogen is already a element in the air. So in other words, nothing will happen. +++
That is Not Correct on both counts. Think about it: hydrogen is extremely flammable. Hydrogen is an element, yes, but not a component of the atmosphere, except perhaps in vanishingly tiny quantities.
Besides, the question posits a deliberate mixing.
Hydrogen burns in air, i.e. combines exothermically with oxygen that IS in the atmosphere, producing water.
Air and blood in a medical setting, such as dialysis are not supposed to mix. When blood and air mix, the clotting process begins to occur.
The air that you breathe out mixes with the rest of the air in your general vicinity, and will eventually mix with all the air in the Earth's atmosphere.
the air around where the kmno4 was added becomes positioned.
Mix air,heat and fuel.
what happens when you mix vinegar and baking soda
Air and blood in a medical setting, such as dialysis are not supposed to mix. When blood and air mix, the clotting process begins to occur.
The air that you breathe out mixes with the rest of the air in your general vicinity, and will eventually mix with all the air in the Earth's atmosphere.
No lightning happens when cold and hot air mix. which is only in summer.
Opening the air hole collar to mix air with the fuel gas results in a hotter flame.
Nothing "happens". Well, other than what you said. The ammonia mixes with the air. And then diffusion, I guess.
Because helium is lighter
what happens when radiation mix's with electricity
Carbon and hydogen
hydogen peroxid
the air around where the kmno4 was added becomes positioned.
Mix air,heat and fuel.
what happens when you mix vinegar and baking soda