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DENJIRO: A self-heating agent is often used in disaster supply kits. Let me show you how they produce heat without any fire. I have two beakers containing the same amount of quicklime. I’m going to add aluminum powder to one of the beakers. Let me shake it a bit. Now I’m going to add the same amount of water to both beakers.
BOY: There’s a lot of steam coming out of the beaker with aluminum powder!
DENJIRO: Both mixtures are emitting heat and steam, but the reaction is much more violent in the beaker with aluminum powder. Let me explain why this is. First, the heat is coming from a chemical reaction.
When water and quicklime react with each other, they turn into calcium hydroxide while emitting heat. If there is aluminum powder mixed in the quicklime, the calcium hydroxide created from water and quicklime reacts with the aluminum powder, and even more heat is emitted. Basically, adding water to a mixture of quicklime and aluminum powder produces two exothermic reactions, and that’s why the reaction is much more intense. This mixture of quicklime and aluminum powder is used as a self-heating agent that can even boil water.
Adding water to quicklime and aluminum powder doesn’t just produce heat. It also produces a certain gas. I have here a self-heating agent in this flask. I’m going to add water and cover it with a rubber stopper with a glass tube in it. Let me bring a flame up to the glass tube.
BOY: It caught fire!
DENJIRO: The gas being produced is hydrogen. It’s a flammable gas, and that’s why you get a flame like this.
NARRATOR: Self-heating agents in a disaster supply kit are flammable as well, so do not use them near an open flame.
DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!”