Heat and Conservation of Mass | Grade 6 | Unit 2 - Concept 2 - Lesson 4 | Science скачать в хорошем качестве

Heat and Conservation of Mass | Grade 6 | Unit 2 - Concept 2 - Lesson 4 | Science

شرح ساينس الصف السادس الابتدائي لغات - الفصل الدراسي الأول شرح ساينس سادسة ابتدائي - ترم أول لينك تحميل الملزمة https://drive.google.com/file/d/1Buha... لينك تليجرام https://t.me/mrahmedelbashagroup In This Lesson: When we want to make a pot to cook food in it, we should use a thermal conductor material such as metal. But when we want to make handles for that pot, we should use a thermal insulator material such as wood or plastic. So, it is safe to touch the handle during cooking. ► If we place three temperature measuring devices along the handle of a pot during heating, we will see three different temperatures. So, the length of the handle is very important. Examples: If you place a pan with 18 cm. handle made of plastic on a stove, and then you measure the temperature at three places on the handle. The result can be as follows. If you use a pan with a 36 cm. handle made of plastic, the measurements can be as follows. When you change the matter of the handle using a wooden handle with 36 cm. length, the measurements can be as follows. From the previous examples, we can conclude that: The measurements of temperature differ from one place to another along the handle of the pan. The handle is warmer closer to the pan and it is cooler as we go far away from the pan, because the heat travels very slowly along the handle that is made of a thermal insulting material. The wooden handle warms up faster than the plastic handle. So, no matter is destroyed or created but it just changes from one state into another. Examples: 1. When you put a bowl of ice cubes on the stove, the ice cubes change into liquid water. • The mass of the ice cubes before heating equals the mass of water after heating. 2. If you put a plastic cup of a juice in a freezer, it freezes but its mass does not change before and after freezing. بالتوفيق مستر احمد الباشا