70 Heat in the Kitchen-Mid

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

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?

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!

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!

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?

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.