DENJIRO: Have you seen liquid oxygen before?
BOY: What? Isn't oxygen a gas?
DENJIRO: Actually, oxygen can become a liquid. Let's look at liquid oxygen to study the properties of oxygen. First, we'll make liquid oxygen. Gaseous oxygen is inside this bag. We're going to cool this to make liquid oxygen. In order to do that, we need to cool oxygen all the way down to -183 degrees Celsius. So, we're going to use liquid nitrogen at -196 degrees. We're going to put in the bag of oxygen into the liquid nitrogen and cool it. When a gas gets cooled down to a liquid, its volume decreases. That's why the bag is shrinking.
When we take out the bag, we see liquid inside the bag. This is liquid oxygen. I repeated this procedure many times to create this much liquid oxygen. Look at its color.
BOY: It's blue!
DENJIRO: Oxygen in its gaseous state is transparent, but it's blue in the liquid state. Let's perform an experiment using this liquid oxygen. Here's a neodymium magnet, which has a very strong magnetic force. I will dip this magnet into the liquid oxygen. Watch carefully.
BOY: The liquid stuck to the magnet!
DENJIRO: Oxygen is paramagnetic and has a very weak magnetic force. That's why it stuck to the magnet although it is liquid.
For our next experiment, we'll use this metal wire. What will happen when we heat the tip of the metal wire and dip it into liquid oxygen?
BOY: It's burning violently!
DENJIRO: The metal wire burned violently and quickly disappeared. Oxygen has a property that aids combustion. Since liquid oxygen is highly concentrated, bringing fire near it will cause a violent combustion.
I hope energy will bring you all happiness. Our magic word is "Happy Energy!"
Негізгі бет Properties of Liquid Oxygen / Mr. Denjiro's Happy Energy!
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