Flashcards
Heat and Temperature study
Flashcards do conjunto (49)
- 1Heat is a form of...Energy.
Energy comes from movement of tiny particles that make up all matter - 2Standard of livingA measure of how well we live, and the goods used to meet those needs
- 3SustainableSomething that can be maintained or continued for sure
- 4Sustainable looks like...Using our resources wisely and do as little damage as possible to the environments when we use them
- 5Needs vs. WantsNeeds are the basics we need to survive
Wants are aspects of our life that we don't necessarily need to survive - 6What is used to measure heart?jJoulesm (j)
- 7Particle model of matter1) all matter is made up of extremely tine particles
2) the particles are always moving
3) adding heat makes them move faster
4) they have space between them - 8What is this? Particles are attached Has definite shape and volume Particles have limited movement Particles move around in fixed position Less kinetic energySolid
- 9What is this? Particles loosely attached Takes the shape of container More space between particles More movement of particles More kinetic energyLiquid
- 10What is this? Particles are not connected Fills empty space No definite shape or volume More spaces between particles More particle movement More kinetic energyGas
(Repeat characteristics (6)) - 11Water Freezing point? Melton point? Boiling point? Condensation point?0 degrees
0 degrees
100 degrees
100 degrees - 12Thermal energy is...Totals kinetic energy off thr particles in a substance (depends on temp and size)
- 13Heat is...The energy that transfers from one object to another because of the differences in kinetic energy (transfers from high to low)
- 14Temperature is...Measure of average kinetic energy of the particles in the substance
- 15John Locke300 years ago
Proved our sense of touch was not a good way to measure temperature - 16Galileo Galilei1590
First temperature measurement device - 17Daniel Farenheit1700s
More accurate way to measure temperature - 18Anders celcius1742
Different scale to measure temperature - 19Absolute zeroLowest possible temperature
-273.15 celcius - 20ExpansionAs the thermal energy increases the volume increases
( ie train track holders) - 21ContractionAs the thermal energy decreases the volume decreases
( ie train track holders, thermometer, balloon) - 22Thermal expansionExpansion of a substance cause by increase in thermal energy
- 23ConductionTransfer of heat energy between substances that are in contact with each other
- 24ConductorsMaterial that allows transfer of heat
(Metal, water) - 25Insulatorsmaterials that do not allow easy transfer of heat
- 26Convectionheat is transferred when particles move from one area to another, high air rises and cool air sinks
- 27Convection currentwhen the particles move in a circular motion
- 28Radiationtransfer of energy of invisible waves that can travel great distances.
- 29Radiant energyenergy transferred from its source by radiation
- 30Reflect vs. Absordmaterials are shiny and light
materials are dull and ark - 31energy efficient windowshave 2 panels which keep the heat in better some has gasses to improve performance in reducing heat loss
- 32Solar energyenergy from the sun
- 33geothermal energyenergy from deep inside the earth
- 34Natural sources of thermal energyfire, sun, decay, earth
- 35passive heating systembasic approach: reduce heat loss and increase heat gain from the sun
(No mechanical device
Maximizes collecting solar energy
Minimizes heat loss) - 36active heating systemneeds 3 main parts: collector, storage, distributer (solar)
- 37solar arraysolar cells arranged in panels and connected
- 38thermostatsused to control temp in indoors.
BIMETALIC strip has 2 different metals, when one heats and expands it pushes the other one up, when it gets cooler and contracts the comes down and brings the other one with it (turns on and off the furnace) - 39local heating systemprovides heat for a small area (fireplace)
- 40central heating systemprovides heat for a larger area (furnace)
- 41How refrigerators workrefrigerant in storage pumped to freezer
it evaporates as it goes through
cools as evaporates so heat is transferred from warm air in food to the refrigerant
freezer is cooler, refrigerant is warmer
as a gas, it flows through compressor to condersor coils
c coils release refrigerant to environment, which cools it off
refrigerant re enters storage tanks - 42refrigeranta liquid that evaporates at low temps
- 43R valueInsulator rating system, higher is better
- 44Fossil fuelsFrom remains of ants and animals from lots of years ago. Oil by pumping coal is mined. Is most common because easy to transport, large quantities, cheaper.
(Costs) - 45Alternate sourcesWind- captured by wind mills
Nuclear- radioactive uranium and turned into vast amounts of heat
Hydro electric- water dams - 46RenewableNatural resources that can be replaced
- 47Non-renewableNatural resources that cannot be replaced when all used up
- 48Main energy consumersHomes, transportation, industry
- 49CogenerationProduction of 2 types of energy from one energy source. Is see to improve energy efficiency. The 2 types of energy are most commonly heat and electricity
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- FlashCards sobre Heat and Temperature study, criado por Mads06 em 24-02-2015.
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