Science YEE2 8th- Force & Energy Flashcards
Rate of evaporation is affected by (Name 6)
Temprature, boiling point, surface area of liquid, pressure, movement of air, humidity of surrounding air
How does evaporation cause cooling
When molecules with high kinetic energy leave the liquid, the average kinetic energy reduces
Radiation
An electromagnetic wave transfers energy
Conduction
Particles collide with each other
Convection
Hotter fluid is less dense, so it rises. Energy is transferred by the moving liquid
How to reduce radiation
Use shiny white or silver surfaces
How to reduce conduction
Use insulators
How to reduce Convection
Stop the fluid from circulating
What is heat
The hotter an object, the more energy it has in its thermal energy store.
Thermal energy store
The amount of thermal energy stored in an object
Thermal equilibrium
If there is a difference in temperature between two objects, energy transfers by heating from the hotter object to the cooler one.
The greater the temperature difference, the faster the energy is transferred.
When the objects reach the same temperature as the surrounding environment, the energy transfer will stop.
When the objects are at the same temperature, they are in thermal equilibrium.
