C2 Energy Transfers By Heating Flashcards
If an object has a high thermal conductivity it conducts thermal energy ______________.
Quickly
Equation for specific heat capacity
Change in thermal energy (Joules) = mass (kg) x specific heat capacity (J/kg degrees celsius) x temperature change (degrees celsius)
Define a black body
A theoretical object that absorbes 100% of the radiation that it comes into contact with, not reflecting or transmitting any radiation.
Do houses insulation need high or low thermal conductivity to maintain room temperature
Low thermal conductivity as it means there will be a lower amount of heat loss
What 3 factors affect the rate of heat loss from a building
1) thickness of walls and roof
2) Thermal conductivity of roof and windows
3) If windows are double glazed (Thermal conductivity of windows)
How do greenhouse gasses heat the planet
They absorb some of the radiation from the sun, that is usually emitted from the earths surface back into space and re-emit the radiation, increasing the temperature of the earth’s surface and atmosphere.
3 activities that contribute to climate change
- Burning fossil fuels
- Deforestation
- Livestock farming
Equation for specific latent heat
change in thermal energy = mass × specific latent heat
What is meant by specific latent heat
The amount of energy required to change the state of 1 kilogram (kg) of a material without changing its temperature.
