Heat Exchange
Heat Exchange 2
Visuals
Miscellaneous
100
A 90 degrees cup of water is placed in a 72 degrees room and left overnight. What will the temperature be 24 hours later?
The cup will reach equilibrium with the room and drop to 72 degrees
100
In which direction does heat flow?
Always from high to low
100
What is occurring at C?
C- Conduction as the grill is touching the pot
100
What words do we use to remember Conduction?
Touch
200
How will the heat transfer here?
From sample 3 to 4 and 2 (high to low)
200
What kind of heat transfer?
Thermal energy transfers through a liquid or gas.
Energy moves from hot, high energy to cool, low energy.
Ex. Boiling rice
convection
200
What is occurring at B?
B- Convection, as heat is rising in the water
200
What words do we use to remember Convection?
Hot rises, Cold Sinks
300
What is seen when heat is rising, and cold is sinking in a liquid or gas?
Convection!
300
What kind of heat transfer?
Thermal energy transfers through contact.
Ex. Holding an ice pack to cool down your skin
Conduction
300
What is occurring at A?
A- Radiation, as heat is being given off from the pot
300
What words do we use to remember radiation?
Sunlight/ Electromagnetic Waves
400
What type of heat exchange is occurring in the scenarios below (Conduction, Convection, Radiation)
A stove top is on and is heating up the pot sitting on it
The pot is heating the lid
The pasta is being cooked inside the pot
All are Conduction! The pot is touching the stove
400
What kind of heat transfer?
Thermal energy transfers through waves or rays.
No matter is needed for thermal energy to travel.
Ex. Energy from the Sun
Radiation!
400
At what time does the thermal energy transfer begin to slow down?
Around 180ish
400
A tumbler is constructed with a vacuum layer between the inner wall and the outer wall. This means there is no air between the two walls. How is the tumbler affected by the transfer of heat through conduction, convection, and radiation?
Conduction and Convection does not occur because there is no matter in the vacuum layer. Radiation still does occur as it doesn't need mass, but the heat transfer process is slowed by a lare margin.
500
Come up with one example of each- Conduction, Convection, Radiation
Conduction- Touching a hot pan
Convection- Heating a house with a heater
Radiation- The warmth of the sun on your skin
500
Which container was the most effective at preventing heat transfer from the water to the environment?
Cup P, as it loses the least amount of heat
500
In the image above, a rod is placed in 2 cups, and their temperature eventually changes. What occured and why?
Thermal energy from the warmer liquids is transferred to the cooler environment until the liquids reach thermal equilibrium.
Both cups decreased in temperature until equilibrium was reached.
500
What is Mr. Ayala's favorite song?
Dancing in the Moonlight, By King Harvest