Context
Two NASA astronauts aboard Boeing’s Starliner will remain on the International Space Station for months due to helium leaks.
About Helium:
- Inert Gas: Does not react with other substances or combust.
- Atomic Number: 2, making it the second lightest element after hydrogen.
- Boiling Point: Very low at -268.9° C, remains a gas in extremely cold environments.
- Non-toxic: Cannot support respiration, as it displaces oxygen required for breathing.
Helium in Rocket Technology
- Pressurizing Fuel Tanks: Ensures uninterrupted fuel flow to rocket engines.
- Cooling Systems: Used in various rocket cooling applications.
- Filling Empty Spaces: After fuel and oxidiser burn, helium fills the tanks to maintain pressure.
- Non-reactive: Can safely coexist with residual contents in fuel tanks.
- Leakage Characteristics
- Small Atomic Size: Helium’s small size allows it to escape through small gaps in storage tanks or fuel systems.
- Leak Detection: Since helium is scarce in the atmosphere, leaks are easily detectable, aiding in identifying potential faults in rocket systems.
Source:
TH
Previous Year Question
Which of the following adds/add nitrogen to the soil?
1. Excretion of urea by animals
2. Burning of coal by man
3. Death of vegetation
Select the correct answer using the codes given below:
[UPSC Civil Services Exam – 2013 Prelims]
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Answer: (c)
