P1.1
- Created by: frankie306
- Created on: 01-04-15 20:41
View mindmap
- P1.1 energy transfer by heating
- Infrared radiation
- energy transfer by electromagnetic waves
- all objects emit this
- the hotter the object, the more radiation it emits
- surfaces and radiation
- dark matt surfaces
- emit more radiation
- absorb more radiation
- light shiny surfaces
- reflect more infrared radiation
- dark matt surfaces
- states of matter
- solid
- fixed shape and volume
- particles held in fixed positions
- liquid
- fixed volume
- no shape
- particles move randomly touching each other
- gas
- no fixed shape or volume
- particles move randomly and are apart
- solid
- conduction
- metals=best conductors
- free electrons
- wool/ fibreglass = best insulators
- no free electrons
- metals=best conductors
- convection
- circulation of a fluid by heating it
- only in liquids or gases
- less dense = rises upwards
- evaporation
- when a liquid turns into a gas
- cools-faster moving molecules escaping
- increased as
- higher surface area
- increase in temp
- a draught of air
- condensation
- when a gas turns into a liquid
- increased by
- increasing area of surface
- reducing temp on the surface
- transfer by design
- vacuum flask
- plastic cap
- evaporation
- vacuum between two walls
- conduction/ convection
- plastic cover
- good conductor
- spondge pad
- conduction
- silvered sufaces
- radiation
- plastic cap
- rate of transfer
- contact of substance
- objects shape
- surface area
- vacuum flask
- specific heat capacity
- heat required to raise the temperature of the unit mass of a given substance by a given amount
- higher mass = slower temp increase when heated
- home insulation
- Uvalue
- how much energy per second passes through different materials
- lower = more efficient
- loft insulation
- fibreglass-less conduction
- cavity wall insulation
- stops convection currents and radiation
- double glazing
- aluminium foil behind readiators
- radiation
- payback time
- cost / savings per year
- Uvalue
- Infrared radiation
Comments
No comments have yet been made