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Science

Conduction, Convection & Radiation

QuestionAnswer
In what direction does thermal energy flow naturally Thermal energy flows naturally from a substance with a higher temperature to a substance with a lower tempearture
What is conduction Is the transfer of thermal energy through a substance or between substances in contact
How is conduction caused caused by collision of particles
Give an example of conduction cooking an egg in a frying pan
Explain how cooking an egg in a frying pan is conduction 1. energy from the burner travels through the pan into the egg 2. the particles of the pan collide with the particles of the egg causing the eggs particles to move faster 3. this faster motion causes the temperature of the egg to rise
Difference between conductor and an insulator Conductors are the substances which allow the electricity to pass through them (transfer energy) while insulators resist electricity (prevent energy transfer).
What are 2 metals that serve as good conductors to conduct energy from a hot burner to cold food are: 1. Copper 2. Alluminum
What are 3 effective insulators in boots that prevent transfer of thermal energy from warm feet to cold snow? 1. Foam 2. Fleece 3. Felt
What transfers energy less easily in cooking utentils/pots? 1. Plastic 2. Wood
How is thermal energy from deep within the Earth conducted? And what is this energy called? Through matter in the upper layers Geo thermal energy
What does geo thermal help form? Rocks and minerals
What type of rock are the results of conduction Metamorphic, igneous & diamonds
What is convection the transfer of thermal energy from one part of fluid to another by a circulating current of faster-moving and slower-moving particles
Example of convection a pot of soup cooking on a stove
What happens when soup is heated? Water particles near the bottom move fast
What becomes less dense when making soup? The bottom particles are less dense than the top particles
What happens to the colder soup at the top of the pot Its more dense so it sinks to the bottom of the pot
What is a convection current Bottom particles heat up and move to top and top particles cools and falls.
3 natural processes that depend on convection Winds, thunderstorms and the movement of the Earth's crust all depend on convection
What is radiant energy Energy that travels in the form of electromagnetic waves through empty space
What are 3 examples of radiant energy 1. visible light 2. ultraviolet rays 3. infrared rays
What is radiation the transfer of radiant energy through electromagnetic waves
2 things that happen when the suns radiant energy strikes an object. this will depend on 2 factors which are: 1. reflected 2. absorbed a. color b. texture
What 2 things tend to reflect much of the Suns radiant energy back into space and why? snow and ice Because they are white and smooth
what does melting snow uncover Darker rock
What does melting sea ice uncover ocean water
Does rock and water absorb more or less of the radiant energy more
Are rock and water more able or less able to reflect the visible light less
What do cities have that absorb lots of radiant energy roads and buildings
Does wearing black absorb radiant energy? yes
Do shiny or light colors absorb radiant energy better than darker colors? no
Created by: jcadieux