Which of the following is used as a rocket fuel in space research?  

Key Points

• Hydrogen is widely used as a rocket fuel in space research.
• It is chosen because of its high energy content per unit mass.
• Liquid hydrogen is often used in combination with liquid oxygen as an oxidizer to create a highly efficient and powerful propellant.
• This combination is known as cryogenic fuel and is used in the main engines of many space shuttles and rockets.
• Hydrogen fuel's low molecular weight allows it to achieve high exhaust velocities, which is crucial for escaping Earth's gravity.
• It is also a clean fuel as its combustion produces only water as a byproduct, making it environmentally friendly.

 Additional Information

• Diesel
  • Diesel is commonly used as fuel in automobiles, trucks, buses, and trains.
  • It is not typically used in rocket propulsion due to its lower energy density and higher molecular weight.
• LPG (Liquefied Petroleum Gas)
  • LPG is used for cooking, heating, and automotive fuel.
  • It is not suitable for rocket fuel due to its lower energy content compared to hydrogen.
• CNG (Compressed Natural Gas)
  • CNG is widely used as a clean fuel for vehicles.
  • It is not used in rockets due to its lower energy density and storage challenges at high pressures.