70 Heat in the Kitchen-Mid

Heat in the Kitchen FOCUS Question How does heat change food?

厨房中的热量焦点问题热量是如何改变食物的?

Heat It Up! Cool It Down! Time to eat! Let's use heat to cook our food. Heat is a kind of energy. It has the power to change things. What happens to food when you add heat or take heat away?

热起来!冷静点!该吃饭了!让我们用热来煮食物吧。 热是一种能量。它有改变事物的力量。 当你增加或减少热量时，食物会发生什么变化?

Crack an Egg Break open a raw egg. It is gooey inside. Add heat to boil an egg. Then break it open. Now it is hard inside! Cool down the egg. Is it raw again? No way!

敲开一个生鸡蛋。 里面是黏糊糊的。加火煮鸡蛋。 那就把它砸开。现在内心是艰难的!把鸡蛋冷却。 又是生的吗?没门!

Mix and Bake Put flour and sugar in a bowl. Mix in milk, eggs, and oil. Now you have cake batter! It is easy to pour into the pan. Add heat to bake the batter. You can't pour it now, but you can cut it. It's a piece of cake!

在碗里放入面粉和糖。 加入牛奶、鸡蛋和油。 现在你有蛋糕糊了!倒进锅里很容易。 加热烤面糊。 你现在不能倒，但你可以切。 这是小菜一碟!

Ready for Spaghetti Dry pasta is hard. It breaks when you bend it. Cook pasta in hot water. The hot water soaks into the pasta. The pasta gets bigger, and it gets soft. Now you can eat it! Math Moment Your dry pasta weighs 200 grams. After you cook the pasta, it weighs 420 grams. How much more does the cooked pasta weigh than the dry pasta? Why?

干意面很硬。 你一弯曲它就会折断。 用热水煮意大利面。热水渗入意大利面。 意大利面变大，变软。 现在你可以吃了!你的干意面重200克。 煮熟意面后，它重420克。 煮熟的意大利面比干的意大利面重多少? 为什么?

Boil, Freeze, and Melt Heat changes liquids, too. But some liquids change back when they cool down. Heat water. It makes bubbles. Steam rises above the pan. Let the water cool down. The bubbles go away. The steam stops rising above the pan. The water is the same as before you heated it.

煮沸、冻结和熔化，热量也会改变液体。 但有些液体冷却后会变回原来的样子。 加热水。它会产生气泡。 蒸汽从锅上升起。 让水冷却下来。气泡消失了。 蒸汽不再从锅上上升。 水和加热前是一样的。