Making Use Of Energy Flashcards
What happens to liquids and gases when they are heated
Expand because the particles in liquids and gases move faster when they are heated than when they do when they’re cold
When does convection occur
When particles with a lot of heat energy in a liquid or gas move and take place of particles with Less heat energy
How are convection currents that transfer heat set up
Dense cold liquids or gases falls into the warm areas in this way convection currents transfer heat from place to place a set up
What happens to the hotter metals
The hotter the metal more kinetic energy vibrations have, the kinetic energy is transferred from hot parts of the metal to cool parts by the free electrons
How is double glazing windows with air affective
Convection is minimised because there is a little room for air move, and also air is a poor conductor so poor heat loss by conduction
What metals are good and bad conductors
Metals are good conductors and non-metals are bad/poor
What are poor conductors called
Insulators
What do you use for cavity wall insulation
You put the insulation material into the gap between brick and the inside wall
States of matter does convection occur in
Liquids and gases - fluids
The liquids and gases in what area or more or less dense
The liquid in gas in hot areas are less dense than the liquid or gas in cold areas so it rises to the cold areas
When can convection be seen
Lava lamps, ocean and weather currents and hot air balloon rising
Waste fitting double glazing windows with a vacuum beneficial
There will be no conduction or convection
A result of an expanding what happens
They take up more volume this is because of the gaps between particles increase while the particles themselves say the same size
How does cavity wall insulation stop heat energy lost by radiation
It often has a silver foil layer in order to reduce the heat loss by infrared radiation by reflecting back into the building
Why is cavity wall insulation effective in conduction and convection
Because the material contains pockets of air trapped and therefore reducing conduction and convection also the fibres of the insulation also prevents the trapped air circulating and causing a convection current
