Page 131 - แผนการสอน 63-2
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วิทยาศาสตร (ว 21104) ชั้นมัธยมศกษาปท 1
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ชวนคิด
1. น ้า 1 kg อุณหภูมิ 30 องศาเซลเซียส ต้องการต้มให้เดือดเป็นน ้า 100 องศาเซลเซียส ความจุความร้อน
จ้าเพาะของน ้า 4,180 J/kg K จะต้องใช้ความร้อนเท่าใด
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2. น ้าแข็งมวล 200 กรัม อุณหภูมิ 0 องศาเซลเซียส ท้าให้หลอมเหลวกลายเป็นน ้าหมดที่ 0 องศาเซลเซียส
จะต้องใช้ความร้อนเท่าไร
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3. น ้ามวล 2,000 กรัม มีอุณหภูมิ 25 องศาเซลเซียส ต้องการให้ความร้อนจนมีอุณหภูมิสูงขึ นเป็น 85 องศา
เซลเซียส จะต้องใช้ปริมาณความร้อนเท่าไร
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