Helium and hydrogen gas are commonly used in gas weather balloons However, hydrogen gas is not recommended for party balloons. What are some of the reasons? Hydrogen gas is explosive. Hydrogen gas dissolves the party balloons. Hydrogen gas weighs less than helium. Hydrogen gas is expensive

Hydrogen gas is not recommended for party balloons primarily because:<br /><br />1. **Hydrogen gas is explosive**: Hydrogen is highly flammable and can easily ignite, posing a significant safety hazard. This makes it unsuitable for use in environments where there are people, such as parties.<br /><br />The other reasons listed are less relevant or incorrect:<br />- **Hydrogen gas dissolves the party balloons**: This is not true. Hydrogen does not dissolve latex or other materials typically used for party balloons.<br />- **Hydrogen gas weighs less than helium**: While this is true (hydrogen is lighter than helium), it is not a reason to avoid using hydrogen in party balloons. In fact, being lighter would make balloons float better.<br />- **Hydrogen gas is expensive**: This is incorrect. Hydrogen is generally cheaper than helium. The cost is not the primary concern; safety is.<br /><br />Therefore, the main reason hydrogen gas is not recommended for party balloons is due to its explosive nature.