heat (kalor)
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HEAT
byNovianty
RSA1C312002Physics PGMIPA U
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The Material : Definition of Heat
Formula of Heat
Effect of Heat on States of Matter
The Black Principle
Heat Transfer
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Heat is a form of energy that moves from a hightemperature object to a lower temperature object
In the SI system, the unit of heat is JOULE (J)But, heat is sometimes stated in a special energy unitcalled CALORIE (CAL)
What is Heat ?
calorieJoule 24,01 Joulecalorie 2,41
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To measure amount of heat with CALORIMETER
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Formula of Heat
The amount of heat absorbed or released by a substance is :
With :Q = amount of Heat (J or cal )m = mass of object (kg)c = spesific heat of substance (J/kg oC)∆T = temperature rise (oC or K)
final temperature – initial temperature ( T-To)
Q = m.c.∆T
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Effect of Heat on States of Matter
• Changes in states of matter, which releases heat :
freezing
condensating crystalizing
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• Changes in states of matter, which requires heat :
melting steaming
subliming
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The Black Principle
The black principle :” Amount of heat released by the subtance with higher temperature is equal to the amount of heat absorbed by the substance with lower temperature ”
receivedreleased QQ
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Heat Transfer
There are 3 ways of heat transfer :1. Conduction2. Convection3. Radiation
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1. Conduction
Conduction is heat transfer without particle transferExample : Heating Iron
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2. Convection
Convection is heat transfer with particle transferExample : Heating Water
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3. Radiation
Radiation is heat transfer doesn’t require any mediumExample : Sun rays to earth
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THAT’S ALLAND
THANK YOU