McGraw-Hill Science 2005 Return to Unit List
Grade 4
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The flow of from one material to another is heat. Heat moves from objects to objects. The more energy an object has, the its particles move. When a hot object touches a cool object, the particles in the hot object cause the particles in the cool object to . Heat always flows from an object with to an object with . When you measure how hot or cold something is, you are finding its .
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