Heat Transfer
What is Conduction?
Conduction is a type of heat transfer through direct contact.
What is Thermal Energy?
Thermal Energy is total kinetic energy of the particles in a substance.
What is a conductor?
A material that allows heat to pass through easily.
What is thermal conductivity?
Thermal conductivity tells how easily heat flows through a material.
In a science demo, a metal spinner (carousel) is placed above a lit candle. After a little while, the spinner starts to turn. What kind of heat transfer makes it spin, and how does it work?
The heat transfer is called convection. The candle heats the air above it, and warm air rises because it's lighter. As the warm air moves up, it pushes on the spinner and makes it turn.
What is Convection?
Convection is a type of heat transfer that is caused by circulation of glasses or liquids.
What is Temperature?
The measure of how hot or cold something is
What is an insulator?
A material that resists the flow of heat.
What is metal?
Metal heats up quickly because it transfers thermal energy easily.
Ice melted fastest on a metal spoon and slowest on plastic and wood. What type of heat transfer is this, and why did metal work best?
The heat transfer is conduction. Metal is a good conductor, so it moves heat to the ice faster. Plastic and wood don’t transfer heat well, so the ice melted slower.
What is Radiation?
Radiation is a type of heat transfer that happens between electromagnetic waves.
What is the unit for temperature
The Kelvin
What is a example of a Conductor?
Copper or aluminum
What is low thermal conductivity?
Low thermal conductivity is would be good for keeping soup hot in a thermos.
An ice cube melted faster on a block that was metal and cold. The other one that felt warm and was plastic. What kind of heat transfer is this, and why did the cold-feeling block melt the ice faster?
The heat transfer is conduction. The metal block is a good conductor, so it moves heat from the table to the ice quickly. The plastic block is a poor conductor, so the ice melted slower.
A metal spoon getting hot in a bowl what heat transfer is this a example of?
Conduction
What happens to the particles in a substance when it is heated?
They move faster
Rubber or wood
True or False, Metals usually have high thermal conductivity?
True
A candle is lit and the temperature around the candle is warmer then the room. What kind of heat transfer is this. Why does this happen?
The heat transfer is Radiation. The temperature is emitted in all directions, not just up. This means air molecules all around the candle will absorb radiation which will cause the air temperature to increase.
You are roasting marsh mellows over a fire what example of heat transfer is this?
Radiation
What change in state occurs when you add thermal energy to a solid?
Melting
True or False, Rubber is a good conductor of heat and electricity?
A material that does not allow heat to pass through easily is called an __________.
Insulator
How does a lava lamp demonstrate heat transfer, and what causes the blobs of wax to move up and down inside the lamp?
A lava lamp demonstrates heat transfer through convection. When the lamp is turned on, the bulb inside heats up the wax at the bottom. As the wax gets warmer, it becomes less dense and rises to the top of the lamp. When the wax reaches the top, it cools down, becomes denser, and then sinks back to the bottom.