DENJIRO: Today's theme is rockets. First, let's recreate a rocket launch. Now, please steadily send in oxygen.
Such power and force! Rockets use oxygen and fuel to create a strong combustion. The gas created in this process is then shot out, and as a result, the rocket goes flying. In the case of this model, the acrylic tube works as fuel as it melts.
Speaking of rockets, there is another popular scientific experiment using plastic bottles. It's also known as a water rocket. What is the role of water in this rocket? Let's compare the difference between a rocket with just air and a rocket with both water and air.
ASSISTANT: 3, 2, 1.
DENJIRO: The plastic bottle rocket with both water and air flew at a higher speed. I'll explain how this occurred using this rocket car model. I'm going to fill this case with gas, close the lid, and use an electric spark to ignite the gas. This will cause the lid to fly off, and the rocket car will move forward from the recoil. Now, let's see the difference between a light lid and a lid with weights on it.
Though the amount of energy from the gas is the same for both experiments, the speed at which the rocket car moves is quite different. If the lid is light, the lid will take more of the recoil energy, so the lid flies off quickly and the rocket doesn't move as much. On the other hand, with the heavier lid, the rocket will take more of the recoil energy, so the rocket moves faster.
In the case of water rockets, water, which is heavier than air, will cause the rocket to take on greater force. That's why the rocket moved faster with water.
Now, let's try putting liquid nitrogen in the rocket instead of water.
ASSISTANT: Lift off!
DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!"
Негізгі бет Rocket Launch / Mr. Denjiro's Happy Energy!
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