石灰の性質／Lime

DENJIRO: Please take a look at this. I will pour water onto this white rock. GIRL: What is happening? DENJIRO: A chemical reaction between the rock and water is creating heat. This white rock is called “quicklime.” You can make it by doing something to a rock found by a river. This is what the rock looks like before it is turned into quicklime. It is called “limestone.” Like seashells, it is made of calcium carbonate. Let's pour water onto it. Limestone does not react to water. Quicklime is actually created by burning limestone. Let's create quicklime. There's charcoal burning inside this cooking stove. We'll put the limestone in here. I'm going to use a fan to send air into the stove to raise the temperature even more. Limestone turns into white quicklime when heated at 900 degrees Celsius or higher. I heated the limestone for about 60 minutes. The rocks have since cooled down and have now been turned into quicklime. I will pour water on them. A chemical reaction occurred. When quicklime reacts with water, it turns into slaked lime. NARRATOR: Quicklime produces heat when it reacts with water, so it is used to warm packed meals. Pulling the string outside the case will make the water and quicklime react inside. DENJIRO: I hope energy will bring you all happiness. Our magic word is "Happy Energy!"