Conductors & Insulators
Allows thermal energy to move through them efficiently
Conductors
A metal container on a stove gets hot by _____.
conduction
Name one of the two temperature scales used for science.
Celsius or Kelvin
You've been playing out in the cold. When you come inside to wash your hands for dinner, the water feels warmer than normal even though it's the normal temperature. Why is that?
The water has a higher temperature than your skin.
Tool used to measure temperature
thermometer
Iron is an example
Conductor
Transfer of heat through empty space
radiation
When temperature increases, do molecules move faster or slower?
faster
There are two metal containers filled with ice on the counter. One is wrapped with cloth. The other is not. The ice in the one that is not wrapped melts faster. Why is that?
It doesn't have an insulator like the cloth to slow down the thermal energy that is entering the container from the air.
Which color absorbs the most heat
Black (because it absorbs all wavelengths of light)
Does not allow thermal energy to pass through them very well
Insulators
Heat transfer where hotter, less dense fluids rise and colder, more dense fluids sink
Convection
At what temperature does water boil in degrees Celsius?
100
You are roasting marshmallows over a campfire with a stick you found in the wood pile. Your friend asks you to roast one for them too. They hand you their metal roasting stick. You notice that your hand holding the metal stick gets hot, but the one holding the wooden stick does not. Why is that?
Metal is a conductor. Wood is an insulator.
White and this "shiny" color are great at reflecting light
Silver
Rubber is an example
Insulator
Your mom warms you up with a hug
conduction
If particles have the same temperature, they have the same amount of _____ energy.
kinetic
Over Christmas break you stay in a cabin in the snowy mountains. There is a wood burning stove to warm the cabin. As fire burns inside the stove, you are warmed by radiation and convection. Why is that?/How does that work?
The stove radiates heat into the room. The air (gas/fluid) in the cabin is warmed. The warm air rises. The cool air sinks. This causes a convection current.
Heat wants to move from _____ to _____.
warm/hot to cool/cold
Aluminum is an example
Conductor
You feel warm when you stand by a bonfire.
radiation
At what temperature does water freeze in degrees Celsius?
0
You fill a glass with warm water. For the fun of it, you measure its temperature. It's 30 degrees Celsius. After leaving it on the table a while, you come back and check the temperature again. It is now 24 degrees Celsius. Why is that?
The air in the room is cooler than the water in the glass. Therefore, heat moves from the water to the air which lowers the temperature of the water.
How do blankets and coats keep you warm?
Include heat transfer in your answer.
They slow down the transfer of heat from your body to the air.