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| The higher the temperature of a substance, the faster is the motion of its molecules |
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| When two substance of different temperature are in thermal contact, heat flows from the higher temperature substance into the lower temperature substance. |
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| When a thermometer is in contact with a substance, heat flow between them until they have the same temperature. |
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| a substance is defined as the energy required to change the temperature of 1 kg of that substance by 1 C. |
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