Mention three properties of hydrogen which makes it possible for filling meteorological balloons ​

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added

Me as soon as possible! me as soon as possible!