Ch 10 - Transfer of Heat and its Effects Flashcards
Define Temperature.
Temperature is the degree of hotness or coldness of an object.
SI unit of temperature
Kelvin (K)
Common units of temperature
- degree Celsius (°C)
- Fahrenheit (°F)
Use of thermometers
To measure the changes in temperature resulting from the transfer of energy.
Heat is a form of…
ENERGYY 🔥🔥🔥
Fill in the blanks!!
Heat flows from a region of ____ temperature to a region of ____ temperature.
higher , lower
When two objects reach the same temperature.
THERMAL EQUILLIBRIUM
Transfer of heat can cause…
EXPANSION & CONTRACTION
What happens when a substance is heated?
When heated, the particles gain energy, move faster and further away from one another. Thus, the volume increases.
What happens when a substance is cooled?
When cooled, the particles lose energy, move slower and closer to one another. Thus, the volume decreases.
Processes of transfer of heat (there’s 3!)
- conduction
- convection
- radiation
Define conduction.
The movement of heat through a medium, without the movement of the medium.
During conduction, heat energy is transferred from the hot end to the cooler end through the _____________ in the medium.
vibration of the particles
During conduction, particles at the heated end _____ energy, vibrate _____ and ___________ with surrounding particles to transfer energy.
gain, faster, collide
Conduction speed (best to worst):
____>____>____
solid > liquid > gas
Good conductors of heat?
- Thermal (heat) conductors
- Metals
Poor conductors of heat?
Heat insulators:
wood, rubber, plastic, glass, water, air
Define convection.
The transfer of heat from one place to another by the movement of fluids (liquids and gases)
How are convection currents formed?
Due to the expansion and contraction of a fluid.
Define radiation.
The transfer of heat from a hotter body to a cooler body without the need for a medium.
Rate of radiation is HIGH if the object has:
* _____ surface
* _____ surface
* _____ coloured surface
* _____ surface area
* _____ temperature
- rough surface
- dull surface
- dark coloured surface
- large surface area
- high temperature
A good radiator is also a good ____ of heat.
ABSORBER
