We all know that oxygen is necessary for burning then how do rockets burn in space without oxygen. A candle goes out when covered with a glass because the oxygen inside gets used up. But then an interesting question comes to mind:
If there is no oxygen in space, how do rockets keep burning and travel to the Moon, Mars, or other planets?
Let’s understand this amazing science in a simple way.
Can Fire Exist Without Oxygen:Watch the video
Do Rockets Need Oxygen from the Air?
The answer is No.
Unlike cars, bikes, or airplanes, rockets do not depend on oxygen from the atmosphere. They carry everything needed for combustion inside the rocket itself.
A rocket carries:
- Fuel
- Oxidizer (a chemical that supplies oxygen)
The fuel and oxidizer are stored in separate tanks. When they mix inside the rocket engine, they react and produce a huge amount of hot gases. These gases rush out from the rocket nozzle at very high speed.
According to Newton’s Third Law of Motion:
For every action, there is an equal and opposite reaction.
As the gases move downward, the rocket is pushed upward.
What Is an Oxidizer?
An oxidizer is a substance that provides oxygen for burning even when there is no air.
Some common rocket oxidizers are:
- Liquid Oxygen (LOX)
- Nitrogen Tetroxide (N₂O₄)
- Hydrogen Peroxide (in some rockets)
Because rockets carry an oxidizer, they can burn fuel even in the vacuum of space.
Why Can’t Aeroplanes Fly in Space?
An airplane cannot fly in space because it depends on the Earth’s atmosphere (air). For an airplane to fly, four important forces must work together.
1. Lift (Upward Force)
Lift is the force that pushes the airplane upward. It is produced when air flows over and under the wings. The special shape of the wings creates a pressure difference, lifting the airplane into the sky.
Without air, there is no lift.
2. Thrust (Forward Force)
Thrust is the force that moves the airplane forward. It is produced by the airplane’s engines, which burn fuel using oxygen from the atmosphere.
In space, there is no atmospheric oxygen, so airplane engines cannot produce thrust.
3. Drag (Air Resistance)
Drag is the force that opposes the airplane’s forward motion. It is caused by air rubbing against the airplane.
Since there is almost no air in space, there is almost no drag.
4. Weight (Gravity)
Weight is the downward force caused by Earth’s gravity. An airplane must generate enough lift to balance its weight.
Gravity still acts in space, but an airplane cannot create lift without air, so it cannot fly there.
How Does a Rocket Reach Space?
1. Lift-off
The rocket engine burns fuel with the oxidizer and creates powerful thrust.
2. Passing Through the Atmosphere
The rocket keeps accelerating while burning its fuel.
3. Entering Space
After leaving Earth’s atmosphere, the rocket still continues to work because it has its own oxidizer.
4. Travelling to the Moon or Other Planets
The rocket or spacecraft uses its engines whenever it needs to change speed or direction.
Can Fire Burn in Space?
Yes—but only if oxygen is available.
If you light a candle in the vacuum of space, it will immediately go out because there is no oxygen.
However, rocket engines create combustion because they carry oxygen in the form of an oxidizer.
Interesting Facts
- Space is almost a perfect vacuum.
- Rockets carry both fuel and oxidizer.
- Modern rockets can reach speeds of over 28,000 km/h.
- The first stage of many rockets separates after its fuel is used up.
- Rockets follow Newton’s Third Law of Motion.
| Feature | Aeroplane | Rocket |
|---|---|---|
| Needs oxygen from air | ✅ Yes | ❌ No |
| Carries its own oxidizer | ❌ No | ✅ Yes |
| Can travel in space | ❌ No | ✅ Yes |
| Needs air to fly | ✅ Yes | ❌ No |
Frequently Asked Questions (FAQs)
1. Why doesn’t a rocket need oxygen from the air?
Because it carries its own oxidizer, which provides oxygen for combustion.
2. Is there oxygen in space?
Space is almost a vacuum, so there is extremely little oxygen available.
3. What is an oxidizer?
An oxidizer is a chemical that supplies oxygen for burning.
4. Can a candle burn in space?
No. A candle needs oxygen from the surrounding air, which is not available in space.
5. Which law explains how rockets move?
Newton’s Third Law of Motion: Every action has an equal and opposite reaction.
Conclusion
Although oxygen is essential for burning, rockets do not depend on the oxygen present in the atmosphere. They carry both fuel and an oxidizer, allowing combustion even in the vacuum of space. The hot gases produced by this reaction create thrust, which pushes the rocket upward and enables it to travel to the Moon, Mars, and other planets.
This is why rockets can successfully operate where there is no air.
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