lesson 1
what are the 3 main things we use heat energy for?
1.stay warm
2. cook
3. clean
how does energy move?
from high to low
what does a thermometer do?
helps measure the heat and temperature.
what are the 3 types of energy transfer?
conduction
convection
radiation
what can we do to prevent heat loss?
window wraps
thick better windows
smaller windows
1. shelter- yes- warmth and using correct materials
2. food/energy- yes- cook food and kill bacteria
3. oxygen- no- nothing
4. water -kind of- to separate salt water
what is expansion?
when the substance increase in volume due to increase in temperature.
what are 5 technologys that helps us with heat energy?
bimettalic strip
thermocouple
thermometer
thermostat
infrared technology
how is the energy trasferred in convection and what state(s) of matter does it use?
what does flammibility mean?
this means how well a substance catches on fire.
what is energy ?
energy is not a substance it cannot be seen, weighed, or take up space.
what is contraction?
when a substance decreases in volume due to decrease in temperature.
what does and refirdgerent do?
its a liquid that absorbs and release heat. thats used in fridges and AC
what are examples of an insulator?
what are examples of an insulators?
insulator examples: wood, plastic, and glass
conductor examples: melt products
how do we keep hear inside of our homes?
using insulators/insulation.
what are the 3 properties of energy?
1. do work
2. move
3. cause change
what is the difference between expansion and contraction
when expansion is happening its giving a substance energy causes the particles to move faster and when contraction happens the decrease in temperature means the energy moves out of the substance.
why is a fridge cold and how does it happen?
a fridge doesnt put cold air inside. but it takes the warm/hot air from the interior and puts it out.
how does an convection current work?
as fluid particles heat up they speed up and spread apart and become lighter which then they rise. once they are far apart they cool down and sink/fall.
conduction: vibration and contact
convection: a circular motion
radiation: travels in waves
what are 6 examples of ways we use heat?
answers may vary
whats the difference between a thermocouple and a bimetallic strip?
a thermocouple is made from 2 metals and welded together at the ends . while a bimetallic strip is made of 2 metals and welded together entirely.
what is radiation? And what stops radiation from passing through it?
radiation is the transfer of energy without the movement of particles that travels through waves.
the things that stop radiation wont go through is anything that absorbs, transmits, or reflects.
what stops conduction, convection, and radiation?
conduction: spaces between particle
convection: insulated container
radiation: absorbs. transmits or reflects