Everyday science (gases): Identify the gas commonly used to fill party/science balloons. Balloons require a gas that is lighter than air and non-flammable for safety. Choose the correct gas.
General Knowledge
General Science
Difficulty: Easy
Choose an option
Answer
Correct Answer: Helium
Explanation
Given data
- Balloons need a lift-giving gas that is safe.
- Options include inert and reactive gases.
Concept/Approach Lift requires a gas less dense than air. Helium is lighter than air and inert (non-flammable), making it the standard choice for balloons. Hydrogen is lighter but flammable—therefore unsafe for general use.
Reasoning • Air density ≈ 1.225 kg/m³ (at STP); helium ≈ 0.178 kg/m³ → provides buoyancy. • Nitrogen/oxygen/argon are close to or heavier than air; they do not provide useful lift.
Final Answer Helium