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2022-06-21 10:41:38
Năng lượng không tự nhiên sinh ra mà cũng không tự nhiên mất đi."Chúng chuyển từ dạng này sang dạng khác hoặc từ vậy nầy sang vật khác".
Ví dụ:Dùng búa đập nhiều lần vào thanh đồng làm thanh đồng nóng lên: Cơ năng chuyển hóa thành nhiệt năng.