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Science test

29 Questions

What is heat? The transfer of energy from the particles of a warmer object to the particles of a cooler object.
How does a game of billiards help to explain heat? The fast moving cue ball collides with a stationary ball and transfers energy to it. the white cue ball slows down and the stationary ball starts to move.
What is temperature? A measure of the average kinetic energy of the particles of a substance.
What is thermal energy? The total kinetic energy and energy of attraction of all the particles.
In what direction does thermal energy flow naturally? Thermal energy naturally moves from a substance with a higher temperature to a substance with a lower temperature
What is conduction? Conduction is the transfer of thermal energy through a substance, or between substances in contact.
How is conduction caused? Conduction is caused by the collision of particles.
Explain how conduction causes an egg to cook in a fry pan? 1. Energy from the burner travels through the pan into the egg. 2. The particles of the pan collide with the particle of the egg, causing the egg's particles to move faster. 3. This faster motion causes the temperature of the egg to rise.
What natural processes are affected by conduction? Geothermal energy, Igneos and Metamorphic rock, and diamonds.
What is convection? The transfer of thermal energy from one part of a fluid to another by a circulating current of faster-moving and slower-moving particles.
Explain how convection causes soup to cook on a stove? The particles near the bottom are faster and are less dense. Less dense soup moves to the top and takes the colder soups space. This creates a convert current - bottom soup warms up.
What natural processes depend on convection? Wind, thunderstorms, and volcano eruption.
What is radiant energy? Energy that travels in the form of electromagnetic waves through empty space.
What is radiation? The transfer of radiant energy through electromagnetic waves.
What two factors determine whether the Suns radiant energy is reflected or absorbed? Colour and Texture.
Do darker or lighter surfaces absorb radiant energy better? Darker.
Why is insulation important? It insulates areas that separate heated areas from unheated spaces.
What is a thermal envelope? Separates a building from the outside.
What parts of a house are part of the thermal envelope? Walls, roof, insulation, windows, doors, finishes, weather stripping, air/vapour barriers.
Why is thermal envelope important for building designers? To stop energy loss.
What parts of the house should be insulated to prevent the loss of energy? Basement walls, outside walls, and roof.
What do R-values of insulation material indicate? The material's ability to resist heat transfer.
What does a higher number in the R-values mean? The better the insulation.
Why is air such a good insulator? Air is a gas and all gases have spread out particles
Besides reducing energy loss, what are three advantages of a green roof? Last a long time, make the air better to breath, people can also enjoy these roofs.
What is the main purpose of an air-to-air exchanger? It trades air inside and outside of a building without losing energy.
Why do builders use special windows containing ''low-E glass''? Low-E glass keeps radiant energy inside in the winter and outside in the summer.
What happens with convection currents. The second floor of a house is often warmer than the ground floor or basement because of air currents.
Created by: oconsoli1010