HEATHEAT

ObjectivesObjectives

After the lesson students should be able to explain:After the lesson students should be able to explain:

Defenition of heatDefenition of heat

Influence of heat to the temperature of matter

Influence of heat to the change of matter phase

LAVOISIER,

“HEAT IS FLUID”

ROBERT MEYER,

“HEAT IS NOT FLUID BUT A FORM OF

ENERGY”

JAMES PRESCOTT JOULE ,

“ THE HEAT IS A FORM OF ENERGY “

THE DEFINITION OF HEAT

HEAT IS THE FORM OF ENERGY TRANSFERS FROM THE HIGHER TEMPERATURE BODY TO THE LOWER TEMPERATURE BODY

HEAT

heat_fluid.mpeg

LEARNING AKTIVITYLEARNING AKTIVITY“The Temprature Change of “The Temprature Change of

Object”Object” ObjectiveObjective

““Observing the temprature change Observing the temprature change in a object because it accepts or in a object because it accepts or releases heat”releases heat”

Devices and MaterialsDevices and Materials

1. Beaker containing hot water1. Beaker containing hot water

2. Tube containing ordinary water2. Tube containing ordinary water

3. Two pieces of thermometer3. Two pieces of thermometer

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Working ProsedureWorking Prosedure1. Measure the water temprature in 1. Measure the water temprature in the beaker and the water temprature the beaker and the water temprature in the tube by putting in the in the tube by putting in the thermometer in the beaker and the thermometer in the beaker and the tube.tube.2. Dip the containing ordinary water 2. Dip the containing ordinary water into the beaker containing hot water into the beaker containing hot water and let it for five minutes.and let it for five minutes.3. Note the temprature shown by 3. Note the temprature shown by each of thermometereach of thermometer4. Note the observation result ini the 4. Note the observation result ini the following table.following table.

OBSERVATION RESULTOBSERVATION RESULT

OBJECTOBJECT INITIAL INITIAL TEMPRETURETEMPRETURE

FINAL FINAL TEMPRATURETEMPRATURE

HOT WATERHOT WATER ……………………………….... ……………………………………

ORDINARY ORDINARY WATERWATER …………………………………… ……………………………………

5. Make the conclusion from the aktivity above

THE INFLUENCE OF HEAT TO THE TEMPERATURE OF MATTER

Tube containing ordinary water is dipped into the beaker containing hot water for five minutes, the temprature of water in the tube increases, while the water temprature in the beaker decreases.

WHY?

The hot water in the beaker releases heat into ordinary water in the tube, and the ordinary water accepts heat from the hot water

THE INFLUENCE OF HEAT TO THE CHANGE OF MATTER PHASE

SOLID LIQUID

GAS

Melting

Freeze

Condensing

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Su

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Vaporizing

CONCLUSIONCONCLUSION

THE FORM OF ENERGY TRANSFERS FROM THE HIGHER TEMPERATURE BODY TO THE LOWER TEMPERATURE BODY IS COLLED HEAT

HEAT CAN BE INFLUENCE TO THE CHANGE OF MATTER PHASE

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