(experiment)Chapter 7:heat
• THIS EXPERIMENT IS TO SHOW THAT THE SUN GIVES OUT HEAT.
• THE PAPER CATCHES FIRE.• THE CONCLUSION IS SUN GIVES OUT
HEAT
• THIS EXPERIMENT IS TO SHOW THAT HEAT CAN BE PRODUCED WHEN THERE IS FRICTION BETWEEN TO OBJECTS.
• BOTH THE STICK AND THE ROCK PRODUCES HEAT AS THERE WERE FRICTION BETWEEN THEM.
RUBBING TWO STICKSSTRIKING TWO STONES
• THIS EXPERIMENT IS TO SHOW THAT HEAT CAUSES SOLID TO EXPAND AND CONTRACTS.
• THE METAL RING EXPANDS WHEN HEATED AND CONTRACTS WHEN COOLED.
• THE METAL RING CAN’T PASS THROUGH THE RING WHEN HEATED AND CAN PASS THROUGH IT AGAIN WHEN IT IS COOLED.
• THE CONCLUSION IS SOLIDS EXPANDS AND CONTRACTS WHEN HEATED AND COOLED
• AFTER FEW MINUTES,THE LIQUID/INDICATOR GOES DOWN BACK AS IT LOOSES HEAT.
• THE CONCLUSION OF THIS EXPERIMENT IS AIR EXPANDS WHEN IS CONTACT WITH HEAT AND CONTRACTS WHEN LOOSES HEAT.
• THIS EXPERIMENT IS TO SHOW THAT HEAT FLOWS BY CONDUCTION.
• THUMBTACK ______ WILL FALL FIRST BECAUSE HEAT FLOWS FROM THE HOT END OF THE IRON ROD TO THE COLD END.
THE PICTURE ABOVE SHOWS HOW HEAT FLOWS BY CONVECTION IN A
LIQUID
THE IMAGE ABOVE SHOWS HOW A VACUMM LOOKS LIKE….
HEAT TRAVELS THOUGH VACUM AS RADIATION OR HEAT RAYS
RADIATION = VACUUM
PAPER COTTON ALUMINIUM FOIL SHEEP WOOL0
2
4
6
8
10
12
14
RATE OF HEAT INSULATORS
. , .2
• DARK, DULL OBJECTS ABSORB HEAT BETTER THAN WHITE, SHINY OBJECTS.
• DARK, DULL OBJECTS GIVE OUT HEAT BETTER THAN WHITE, SHINY OBJECTS.
1)WHAT IS THE CHANGES IN STATE OF MATTER OCCURS DURING THE MELTING PROCESS?2)WHY IS MERCURY USED IN A THERMOMETER?3)AN OBJECT THAT IS A GOOD ABSORBER OF HEAT HAS A SURFACE CONDITION THAT IS ?4)WHAT IS THE SI UNIT OF HEAT?5)WHAT IS THE SI UNIT OF TEMPERATURE?
QUESTIONS BY US
LOGIC QUESTION BY STUDENTS & TEACHER
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